Loved the asthetics and music. The difficulty and puzzles were very intuitive. I really enjoyed it; enough to 100% it!
Constructive (hopefully) criticism:
* Though I'm sure you're planning it, you should replace the system mouse with something more in tune with your game.
* Level 1 check point should be in a place all players will go through. I ended up skipping it going for the ghost block powerup.
* Spike hitbox should be just a bit smaller than the graphic; you can end up hitting it by barely bumping into its side which just doesn't feel right.
* Though I'm sure the player can get used to it, maybe exaggerate the enemy spawner block a bit more before it spawns to give the player more prep time.