Fun game! The puzzles all felt fair and the atmosphere felt just right. The different attacks made the characters feel unique and different.
If you wanted to improve, I suggest adding a short animation for the focus switching between characters. Whenever I switched, I kept expecting the controls to be inversed when in reality they weren't, some sort of small animation (maybe even 1/2 a second) could help this to feel better.
Overall, super fun game! Check out mine if you get a chance!