@Hero- No, they couldn't, because each time it connects, the chat server runs through a list of users. If you aren't on that list, then you get kicked off, or something like that.
Shut up with the copy-paste thing. This game is rated so highly that it will undoubtedly get three badges-- one for each ending. Anyway, 5/5, but there are a few glitches with sound. Also, at one part if you do some actions while a mini-cutscene is occurring, it will mess up.
A great game, with a really great idea, but it needs more variety. Perhaps upgrades or more kinds of enemies would make it a 5, but right now I think a 4/5.