Really interesting game, and quite fun to play too. I really like the level design, as it makes it very easy to learn the game. However, there are a few things I would change if you were to take the game further:
- It can get kind of confusing what is and isn't interactable. I would recommend replacing black and white with dark and light grey respectively for the non-interactable objects
- I'm not too sure about the player's jump. It feels way too floaty due to the long hang time and the levels haven't been designed to leverage that in a way that improves the game. I would recommend watching this video to learn how to improve your jump
- The music doesn't really fit the visuals of the game. The artwork is very minimalistic whilst the music is very polyphonic, and has way to many different timbres to suit your game. (My general rule of thumb for texture of pixel art game music is that the music shouldn't have more staves than the amount of colours in your colour pallet). If you were to continue the game, I would advise you to choose some different music (I wouldn't mind creating something for this)
- Sound effects would help the game feel way more polished. You can use websites like Open Game Art for free sound effects for your game
- Also, I would switch from your CapsuleCollider2D to a BoxCollider2D for your player hitbox. It doesn't feel good being able to slip of corners