Really interesting game. The idea of controlling both characters at the same time seems like a somewhat common one, but it's well executed here.
The enemies were a bit of a frustration for me. The attack is somewhat tricky to pull off effectively, and I died multiple times trying to attack. It seemed like the optimal strategy is to first focus on killing all the enemies, then try to actually solve the puzzle, which removed most of the impact having them in the game. Also, when I first encountered them, my first thought was to try to sneak past them, but their pathing/AI was making that (nearly) impossible. I think the game could be improved by having a controls prompt pop up in the first few levels with controls might have help convey that you are supposed to attack the enemies.