What a perfect jam platforming experience. A lot of thought went into the level design here., and in the way new mechanics/enemies are introduced and how they then have to be combined to solve some puzzles. Great job!
The end boss (no spoilers) is also incredibly well made - felt like the first boss level of Super Meat Boy (which is a huge compliment).
Only complaint is that the world felt empty, but it is clearly because you spent a lot of time making a big level, and the emptiness also kind of adds to the eerie atmosphere.