Not having a variable height jump was a little awkward but if that was a possible upgrade to get it would be VERY funny.
Other then that I think the player moves/falls a bit too fast to control easily but I otherwise didn't have too much of a problem outside of the camera moving too Slowly sometimes when falling.
I didn't fully explore the game but did notice that you're spat back out at the entrance after getting the swim upgrade so I definitely know there's More Game To Explore if I felt the desire to but I'd like to see a bit more polishing up of the audio and gameplay before really diving into it. Cool game overall!