Keep it up man, this is great. Multiplayer with local host? Kickstarter or Indiegogo?
Multiplayer would definitely be a lot of fun to play around with, but I think I'll need to wait until the game is finished before trying to add anything like that. I'll also probably need to stress test how much the engine can handle if more than one person is playing at once; I'm not sure if it can handle all of the destruction in the game while running network code.