Defend the House

Defend your  house from the evil robots. Start out with no defenses, collect materials and build walls and turrets.

Collect materials from the ground by moving over them, there are rare materials when you wander further out.
Scroll through your hotbar and Left-click to selsect a blueprint. Left-Click again to place, Right-Click to deselect.
All turrets will auto-aim except for the trebuchet.
You can only build walls in the predetermined spots on the floor, and they can be upgraded later.