Nice idea. I like how you have to choose to either attack or jump, would be good if this featured more often, perhaps have a few ways to complete the level and the player can choose their play style. Some form of HUD would be good to show what level you're on. I got to the bit where you had to jump down the tunnell with enemies moving left and right, this was way too hard to do with the control system and I gave up after about 20 attempts :)
Nice concept though, with a little more polish and smoother controls you've got a nice little game.