I played the game alone, so I will try to keep that in my while judging the game.
I like the idea of a two player game, it's not something you see very often - especially in this day and age. I liked the idea of the two different players, but I'm not sure a shorter jump is an equal handicap to the faster speed (although that might change if the game was actually played by two different people). I liked how responsive the controls were. The punch mechanic was fun, although I think it could maybe be a bit harder to do. As for the negatives, I was missing a score counter with a leader board, the ability to resize the window. I also think a two player game like this could be hard to play on the small nokia. All in all a fun little game.