I really liked the premise. Very good implementation of the theme. The game is super hard. It reminds me of retro platformers that you just couldn't stop playing despite the fact they were brutally punishing.
Some improvements could be made in movement (less slide for example) and collision detection. There are situation where player sprite can't move over 1 pixel difference in tile height.
All in all, hard but fun. With a bit more polish and attention to level design it could grow into an excellent game.