The level of polishing is incredible! The UI, transitions, feedbacks, settings, everything is really smooth. The art and music are also lovely. the character design especially is really well done and give so much personality to the characters.
One small inconvenience I had was that on controller you can't configure joystick sensitivity, or disable it completely. I have a small (and irregular) drift, resulting in unpredictable movements. But the game was still playable on keyboard, so it's not such a big issue.
Congrats for making such an excellent fan-game!