Bizarre choice to compress it twice. Once with .tar and once with .xz. I tried running both the windows and linux version and it looks for both I can't move left. Okay while playing the game I stumbled on that Q is mapped to left. Not sure if it's keymap issue on my end or a typo in underlying input mapper.
Anyways the game is really fun, the gravity switching is fluid and I like that each section seems like an extension of the area rather than being a transition from one puzzle to the next. Having optional routes helps this too. I do feel like that even if I solve the puzzle the room should reset if I die before leaving. Some puzzles I felt like I was cheating that I can just die to progress faster.