The game is really well done! The animation is really cool. Were all sprites done by yourself? (the are really cool).
There is a little bug (maybe) with wall crawling that could be abused in some levels:
if you hit jum mulitple times (fast) durin while you leap sliding the wall will bring you to the top very fast. But it could be really usifull only in the level where bodies are introduesd, so it is not a big problem