I'll look forward to your updates then. :D
Multiplayer is a pain in the roomba to implement so I totally understand that it's single player only. (Honestly tho, I think your game concept would simply work great for bonking friends online and I do mean that as a compliment.) Proof: My boyfriend has been playing for a couple hours now. Yes, hours. He's started to build the ultimade war machine. So far, I can only describe it as a biblically accurate roomba.
If you don't mind me asking, how did you come up with the idea?