So here's my bug catcher review :L
1. Left click: Place block
2. Right Click: remove block
3. 2 Doors can be on top of each other - DONT WORRY THOUGH! You can still enter even though it looks like only one door :L
4. Space spawns the last enemy you saw/ attacked, at the mouse position.
5. Spawning yourself inside a block ( or an enemy ) renders the entity unmovable. You can always free it though.
6. Ratbone's disappearing bone act
That's all for now, I'm out!