The jumping mechanic of the game is really weird, and I couldn't jump past the spike at level 2. I think there's a few bugs where I can't pick up more than one item, and I saw that you made it harder and players have to restart to level 1 every time you died, which is personally I think is a bad idea. Just let the player restart the level, and give him more hit points.
That said, the background story of the game seems interesting and good job on that, paired with a nice audio compilation too :)