Played the game. My wife and I thought it was nice and simple because it is something that young children could play.
I noticed that player 2 could jump in the beginning and hit player 1 before either left the starting area. I don't know if it is intended or not but thought I would comment on it.
Because the players are so big it can be hard to dodge the opponent. If you could add a third set of platforms and make the player characters smaller it will add more depth to the tactics and character positioning.
If you end up fleshing out the game more let me know if I can help bug/play test the game.