I enjoed playing your game, but I would probably put the first powerup on the ground level to make it dead-obvious that you have to die to progress. And maybe make the powerups wiggle up and down because I didn't even notice them the first few runs. Also the worms later in the game that are on narrower platforms are somewhat frustrating because I guess the assumption is that in any other platformer you can time your jump, but here you don't control your horizontal speed, which is not bad, it just doesn't work very well with this bit of level design.
Edit: despite the above, that's the best game I've played so far.