Cool idea :D

I guess you should add a "synonym" button though, on the other side of the keyboard to allow for some real multiplayer action :D

(maybe also the mouse button)

That'll still count as "one button" if that's one action (you could even have one action per player, actually).

Interesting game, doesn't really count as multiplayer but ok. music is kinda spooky tho. I loled at that "Aoo" sound :))) nice game