Had a play of your game in this video here - at 20:20 -, where I give my thoughts while I play. Hopefully it's helpful feedback.
Loved the look and thought it had a good difficulty curve that introduced new problems you had to think in different ways to solve. Only gripe I had was it was sometimes difficult to tell which portal would connect to which, that got me stuck on some puzzles for a bit, but overall it was great level design throughout!
If you have time I'd greatly appreciate it if you could give my game a go to, happy jamming.