This game is good and has a lot of potential, but there are 4 things I would improve:
1. Movement feels out of control, would love some smooth control like the one from Celeste or Hollow Knight
2. I prefer assets that have the same pixel size for all assets
3. When a level is designed to go from top the bottom, the camera should lean towards bottom instead of top
4. Specially on level 3, platforms and backgrounds interfere with eachother visually