Nice little game! I just think that you should use different colors for the web page background, because it blends with the default background of the game and makes the edges invisible. I would also be nice, if there were some way to move left and right on the ground. And one last thing, i believe the game would play better if player didn't have to release the left/right keys immediately after jumping to bounce off a wall. Although, I didn't play jump king, so I don't know how its done there.