Good entry, nice and simple platformer. I initially didn't understand that damage persisted throughout the different levels, and didn't understand what E did, but after my first test playthrough the game made sense.
Fun game, I used the E too early sadly. I included it in my Ludum Dare 28 compilation video series, if you'd like to take a look :) http://youtu.be/IHhkgdPuakc
The jumping is not not good and the overall character control should be better for a platformer, but the idea is very cool. You never know when is a good time to use the E button, since you never know what's coming ahead. Cool!
The game was fun, I enjoyed the retro feel to it as well. The only problems I had where collision glitches that made get stuck in the middle of platforms and on top of the door.
Was possible to finish the levels without losing any life thanks to the tip at the end. :D