Engineer vs Robots

This game has potential, but I have some suggestions.

• Remove collision from not-yet-built buildings, right now you can stall enemies for free by holding a building in front of them
• Add hotkeys for building
• Make the destruction button a toggle
• Increase the difficulty, the game is too easy right now
• Fix being able to build buildings on top of eachother
• Fix robot physics f.e. building something under them that sends them flying, robots spawning and flinging themselves straight into the engineer