diff --git a/CMakeLists.txt b/CMakeLists.txt
index db10fe7..76d0eb3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,6 +30,7 @@ add_executable(PlatScifi
     src/worldobjects/stationaryimage.h
     src/worldobjects/player.h
     src/worldobjects/staticcollider.h
+    src/worldobjects/spike.h
 )
 target_link_libraries(PlatScifi PRIVATE sfml-graphics)
 target_compile_features(PlatScifi PRIVATE cxx_std_17)
@@ -48,6 +49,8 @@ install(TARGETS PlatScifi)
 set(ASSETS
     essential.txt
     tiv_logo.png
+    grass1.png
+    spike.png
 )
 
 foreach(ASSET ${ASSETS})
diff --git a/README.md b/README.md
index e2af94a..c9be4bf 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,21 @@
 # PlatScifi
 
 A platformer game by the tivect team
+
+## Building:
+
+CMake is required, and SFML will automatically be downloaded.
+
+Check out `README_BuildTemplate.md` for more specific instructions
+
+## Controls:
+
+- `[a]`/`[d]` - move left/right
+
+- `[w]`/`[space]` - jump
+
+- `[s]` - fall faster
+
+- `[r]` - reset to the spawn point
+
+- `[p]` - spawn a bouncing ball or other object (for testing)
diff --git a/src/assets/grass1.png b/src/assets/grass1.png
new file mode 100644
index 0000000..ef21899
Binary files /dev/null and b/src/assets/grass1.png differ
diff --git a/src/assets/spike.png b/src/assets/spike.png
new file mode 100644
index 0000000..4693d05
Binary files /dev/null and b/src/assets/spike.png differ
diff --git a/src/main.cpp b/src/main.cpp
index 69a4cea..8962da3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -11,6 +11,7 @@
 #include "worldobjects/stationaryimage.h"
 #include "worldobjects/player.h"
 #include "worldobjects/staticcollider.h"
+#include "worldobjects/spike.h"
 
 // SFML Demo
 int main() {
@@ -29,10 +30,7 @@ int main() {
     Player* player = new Player(5, 10);
     gameState.spawnObject(player);
 
-    // Debug: create a red cube, blue cube, image, etc.
-    gameState.spawnObject(new RedCube(0, 0));
-    gameState.spawnObject(new BlueCube(0, 0));
-    gameState.spawnObject(new StationaryImage(6, 6, 2, 2, "assets/tiv_logo.png"));
+    // Debug: create a basic level
     // Bottom colliders
     gameState.spawnObject(new StaticCollider(3, 25, 6, 2));
     gameState.spawnObject(new StaticCollider(9, 27, 10, 2));
@@ -42,6 +40,8 @@ int main() {
     gameState.spawnObject(new StaticCollider(25, 0, 2, 19));
     // Extra blocks
     gameState.spawnObject(new StaticCollider(23, 29, 44, 19));
+    // Spike
+    gameState.spawnObject(new Spike(28, 28));
 
     // Main game loop
     while (window.isOpen()) {
diff --git a/src/renderer.cpp b/src/renderer.cpp
index c943dda..263d82c 100644
--- a/src/renderer.cpp
+++ b/src/renderer.cpp
@@ -3,7 +3,7 @@
 Renderer::Renderer(sf::RenderWindow& window, AssetHandler& assetHandler)
     : window(window), assetHandler(assetHandler) { }
 
-void Renderer::renderFromData(RenderData& data) {
+void Renderer::renderFromData(RenderData data) {
     // TODO: implement other types (like images)
     if (data.type == RenderType::Rectangle) {
         // Rectangle
diff --git a/src/renderer.h b/src/renderer.h
index f2fa147..c2c7958 100644
--- a/src/renderer.h
+++ b/src/renderer.h
@@ -19,7 +19,7 @@ class Renderer {
     Renderer(sf::RenderWindow& window, AssetHandler& assetHandler);
 
     // Render from a RenderData object
-    void renderFromData(RenderData& data);
+    void renderFromData(RenderData data);
 
     // Set the camera
     void setCamera(double newWorldCameraCenterX, double newWorldCameraCenterY, double percentEasing = 0.0);
diff --git a/src/worldobject.cpp b/src/worldobject.cpp
index 47bb6ed..aa267c6 100644
--- a/src/worldobject.cpp
+++ b/src/worldobject.cpp
@@ -33,6 +33,10 @@ double WorldObject::getHeight() {
     return height;
 }
 
+bool WorldObject::hasAttribute(ObjectAttribute attribute) {
+    return objectAttributes.find(attribute) != objectAttributes.end();
+}
+
 RenderData WorldObject::getRenderData() {
     return {
         RenderType::Rectangle,
diff --git a/src/worldobject.h b/src/worldobject.h
index d6e0982..294d419 100644
--- a/src/worldobject.h
+++ b/src/worldobject.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <vector>
+#include <set>
 #include "renderdata.h"
 #include "worldstate.h"
 
@@ -10,6 +11,12 @@ enum class UpdateResult {
     Destroy
 };
 
+// The attributes that an object can have
+enum class ObjectAttribute {
+    Collision,
+    Deadly
+};
+
 // Stores a world object
 class WorldObject {
 protected:
@@ -18,6 +25,8 @@ class WorldObject {
     double locy;
     double width;
     double height;
+    // TODO: enum instead of stringly typed?
+    std::set<ObjectAttribute> objectAttributes;
 
 public:
     // Create the WorldObject
@@ -34,6 +43,8 @@ class WorldObject {
     double getWidth();
     double getHeight();
 
+    bool hasAttribute(ObjectAttribute attribute);
+
     // TODO: get whether a rectangle is inside of this object
 
     // Return the results to render
diff --git a/src/worldobjects/bluecube.h b/src/worldobjects/bluecube.h
index 7b84caa..a0d8cf5 100644
--- a/src/worldobjects/bluecube.h
+++ b/src/worldobjects/bluecube.h
@@ -12,6 +12,7 @@ class BlueCube : public WorldObject {
     BlueCube(double spawnx, double spawny) : WorldObject() {
         locx = spawnx;
         locy = spawny;
+        objectAttributes.insert(ObjectAttribute::Collision);
     }
     
     // Override the update function
diff --git a/src/worldobjects/player.h b/src/worldobjects/player.h
index 3ce927d..9414cdd 100644
--- a/src/worldobjects/player.h
+++ b/src/worldobjects/player.h
@@ -57,26 +57,37 @@ class Player : public WorldObject {
         // todo: when hitting multiple?
         for (WorldObject* object : objects) {
             if (object == this) continue;
-            // X movement pushout
-            // todo: better way of doing the 0.1 thing
-            if (locy + height - 0.1 >= object->getLocy() && locy + 0.1 < object->getLocy() + object->getHeight()) {
-                // Within the y
-                if (locx + width > object->getLocx() && locx < object->getLocx() + object->getWidth()) {
-                    // Side wall
-                    locx -= velx;
-                    velx = 0;
+            bool collided = false;
+            if (object->hasAttribute(ObjectAttribute::Collision)) {
+                // X movement pushout
+                // todo: better way of doing the 0.1 thing
+                if (locy + height - 0.1 >= object->getLocy() && locy + 0.1 < object->getLocy() + object->getHeight()) {
+                    // Within the y
+                    if (locx + width > object->getLocx() && locx < object->getLocx() + object->getWidth()) {
+                        // Side wall
+                        locx -= velx;
+                        velx = 0;
+                        collided = true;
+                    }
                 }
-            }
-            if (locx + width >= object->getLocx() && locx < object->getLocx() + object->getWidth()) {
-                // Within the x
-                if (locy + height > object->getLocy() && locy < object->getLocy() + object->getHeight()) {
-                    // Floor/ceiling
-                    locy -= vely;
-                    vely = 0;
-                    // todo: should not be on ground on a bottom corner
-                    onGround = true;
+                if (locx + width >= object->getLocx() && locx < object->getLocx() + object->getWidth()) {
+                    // Within the x
+                    if (locy + height > object->getLocy() && locy < object->getLocy() + object->getHeight()) {
+                        // Floor/ceiling
+                        locy -= vely;
+                        vely = 0;
+                        collided = true;
+                        // todo: should not be on ground on a bottom corner
+                        onGround = true;
+                    }
                 }
             }
+            // Collision stuff
+            if (collided && object->hasAttribute(ObjectAttribute::Deadly)) {
+                // Die
+                // todo: impl
+                teleport(5, 10);
+            }
         }
         return UpdateResult::None;
     }
@@ -91,7 +102,7 @@ class Player : public WorldObject {
             locy,
             width,
             height,
-            { 255, 0, 0 },
+            { 0, 255, 0 },
             ""
         };
     }
diff --git a/src/worldobjects/spike.h b/src/worldobjects/spike.h
new file mode 100644
index 0000000..cf8a9c1
--- /dev/null
+++ b/src/worldobjects/spike.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include "../worldobject.h"
+
+// Stores a stationary image at a point in space
+class Spike : public WorldObject {
+private:
+    // Frame oscillations
+    long frameCount = 0;
+
+public:
+    // Constructor: provide the name of the asset from assets (ex. "assets/tiv_logo.png")
+    Spike(double spawnx, double spawny) : WorldObject() {
+        locx = spawnx;
+        locy = spawny;
+        this->width = 1;
+        this->height = 1;
+        objectAttributes.insert(ObjectAttribute::Collision);
+        objectAttributes.insert(ObjectAttribute::Deadly);
+    }
+
+    // Override update: do nothing
+    UpdateResult update(WorldState& worldState, std::vector<WorldObject*>& objects) {
+        return UpdateResult::None;
+    }
+
+    // Override rendering
+    RenderData getRenderData() {
+        frameCount++;
+        return {
+            RenderType::Image,
+            coordType,
+            locx,
+            locy - sin(frameCount / 400) * 0.3,
+            width,
+            height + sin(frameCount / 400) * 0.3,
+            { 255, 0, 0 },
+            "assets/spike.png"
+        };
+    }
+};
diff --git a/src/worldobjects/staticcollider.h b/src/worldobjects/staticcollider.h
index 4c70a5b..148258f 100644
--- a/src/worldobjects/staticcollider.h
+++ b/src/worldobjects/staticcollider.h
@@ -11,6 +11,7 @@ class StaticCollider : public WorldObject {
         locy = spawny;
         this->width = width;
         this->height = height;
+        objectAttributes.insert(ObjectAttribute::Collision);
     }
 
     // Override update: gravity
@@ -22,14 +23,14 @@ class StaticCollider : public WorldObject {
     RenderData getRenderData() {
         // TODO: image/animations
         return {
-            RenderType::Rectangle,
+            RenderType::Image,
             coordType,
             locx,
             locy,
             width,
             height,
             { 14, 92, 81 },
-            ""
+            "assets/grass1.png"
         };
     }
 };