Super interesting game. I think your level design does a great job at teaching the player about the relation between the two halves. Especially given the time frame I think there's a great diversity in the puzzles and it feels like a fair amount of thought went into them.
Only real complaint is, as others have mentioned, the jumping is a bit wonky. Mid-air control and getting stuck on walls while jumping at them are the biggest offenders.
Other than that though I think it's a really cool idea that was well executed.