Completed some items.

Planned-construction.md

@@ -3,17 +3,18 @@ These are the items that are planned to be included in caa-game.
 If anything is completed put a checkmark (√) before it. If anything is not going to be completed (impossible to create, too much time), but a cross mark (x) before it. **Feel free to change anything**
 
 - good level design (3 - 4 floors?)
-    - [assets]: ladder
-    - [assets]: stairs
+    - √ [assets]: ladder
+    - √ [assets]: stairs
+    - Level design
 - support for multiple levels
-    - [assets]: door
+    - √ [assets]: door
     - [assets]: gate
     - [code]: level switching
 - monsters
     - [assets]: monster grahics
     - [code]: AI
 - Lighting
-    - [assets]: torches
+    - √ [assets]: torches
     - ? [assets]: lanterns
     - ? [code]: dynamic lighting
     - [assets]: apply brightness(50%) to all non-light-emitting assets.