I played the game, and the gameplay was both engaging and well-polished!
Here are a few suggestions that could make it even better:
First, the sound design was great overall, but some areas felt a bit too quiet. For example, adding sound effects when dissolving enemies would make the experience feel more complete.
Second, adding variety to certain game elements could really enhance the gameplay and atmosphere. For instance, using different styles of note paper or introducing two or three unique enemy model would keep things visually fresh.
Overall, it was a great game, and I really enjoyed it, well done!