Hi!
This game is simple, but very good because of it. I would've never come up with the 'single-key-playstyle' and I like it a lot. Also, a game that's local multiplayer on keyboard and works, is amazing :) I don't have a lot of words for the gameplay, as it's really straight forward, but fun. Not a lot of sound effects, but the ones you have fit the game very good! I also love the art-style (and the little guys hopping around like that :)).
To summarize: a simple, but good game.
-Remi