diff --git a/apps/demos/crawl/data/assets/mossy_rock.png b/apps/demos/crawl/data/assets/mossy_rock.png
new file mode 100644
index 0000000..8aa6f4b
--- /dev/null
+++ b/apps/demos/crawl/data/assets/mossy_rock.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:03e495dd39deb47191beb57267c1ad0e0c1e1a823c8e06bb1344c751e275bdb4
+size 34907
diff --git a/apps/demos/crawl/data/levels/00.lvl b/apps/demos/crawl/data/levels/00.lvl
index 798b326..8631102 100644
--- a/apps/demos/crawl/data/levels/00.lvl
+++ b/apps/demos/crawl/data/levels/00.lvl
@@ -13,19 +13,20 @@
 -- Defines classes under symbols, which could have properties attached.
 # stone_wall
   wall_texture : /assets/brick.png
+  solid : 1
 . stone_floor
-  tile_texture : /assets/pebbles.png
+  tile_texture : /assets/mossy_rock.png
 @ player_spawn
-  unique :
+  unique : 1
   face : south
   hold : torch
-  tile_texture : /assets/pebbles.png
+  tile_texture : /assets/mossy_rock.png
 X door
   open_on_signal : sg_torch0
-  tile_texture : /assets/pebbles.png
+  tile_texture : /assets/mossy_rock.png
 / lever
   on_interact_emit : sg_torch0
-  tile_texture : /assets/pebbles.png
+  tile_texture : /assets/mossy_rock.png
 
 @meta
 -- Arbitrary sections could be defined with value pairs.
diff --git a/apps/demos/crawl/data/scripts/game.lua b/apps/demos/crawl/data/scripts/game.lua
index 71e4a42..f5a73a2 100644
--- a/apps/demos/crawl/data/scripts/game.lua
+++ b/apps/demos/crawl/data/scripts/game.lua
@@ -36,15 +36,19 @@ function game_tick()
         ctx.udata.player.direction = { x = -ctx.udata.player.direction.z, y = ctx.udata.player.direction.y, z = ctx.udata.player.direction.x }
     end
 
-    local direction = { x = 0, z = 0 }
+    local move = { x = 0, y = 0 }
     if input_action_just_released { name = "walk_forward" } then
-        direction = { x = direction.x + ctx.udata.player.direction.z, z = direction.z + ctx.udata.player.direction.x }
+        move = { x = move.x + ctx.udata.player.direction.z, y = move.y + ctx.udata.player.direction.x }
     end
     if input_action_just_released { name = "walk_backward" } then
-        direction = { x = direction.x - ctx.udata.player.direction.z, z = direction.z - ctx.udata.player.direction.x }
+        move = { x = move.x - ctx.udata.player.direction.z, y = move.y - ctx.udata.player.direction.x }
     end
 
-    ctx.udata.player.position = { x = ctx.udata.player.position.x + direction.x, y = ctx.udata.player.position.y + direction.z }
+    if ctx.udata.level.grid[ctx.udata.player.position.y + move.y][ctx.udata.player.position.x + move.x].solid ~= nil then
+        move = { x = 0, y = 0 }
+    end
+
+    ctx.udata.player.position = { x = ctx.udata.player.position.x + move.x, y = ctx.udata.player.position.y + move.y }
 
     ctx.udata.player.position_lerp.x = qlerp(ctx.udata.player.position_lerp.x, ctx.udata.player.position.x, ctx.frame_duration * 30)
     ctx.udata.player.position_lerp.y = qlerp(ctx.udata.player.position_lerp.y, ctx.udata.player.position.y, ctx.frame_duration * 30)
@@ -53,9 +57,9 @@ function game_tick()
 
     draw_camera {
         position = {
-            x = ctx.udata.player.position_lerp.y * 2 + 1,
+            x = ctx.udata.player.position_lerp.y * 2 + 1 - ctx.udata.player.direction.x / 2,
             y = 1,
-            z = ctx.udata.player.position_lerp.x * 2 + 1,
+            z = ctx.udata.player.position_lerp.x * 2 + 1 - ctx.udata.player.direction.z / 2,
         },
         direction = ctx.udata.player.direction_lerp,
     }