Cute little game, had fun playing!
The concept itself is a nice idea. I feel what would improve this game first and foremost is more polishing. A few things I noticed:
- The main menu and especially the "How to play" popup looks really scuffed. That could be cleaned up a little to not scare new players away.
- The movement is a bit slow and moving diagonally actually lets you move faster (Pythagoras hates this trick).
- I would make the movement snappy, I see you're using Unity, so you probably use forces and RigidBodies and stuff to move the player. I would go simpler and just apply velocity when a button is pressed. This usually feels better for pixel-art games.
Overall this is a nice game with an interesting gameplay loop that fits the theme quite well!