I'm glad you added some checkpoint mechanic, the game is pretty tough.
The overall feeling of this game is cool, but the one hit dead thing is a bit to much punishment in my eyes. I was a bit frustrated because at one point I wasn't able to go on. The graphics are clean and make the game easy to understand and you always know where to go.
Add some more juice, fancy music, flowing particles and screenshake and make a cool mobile time waster out of this :) Good job!