There's a few changes that could help.
- First of all, most of the time you don't know where to jump next. This could be fixed by moving the camera down relative to the player. I mean, if your goal is to dive deeper then even having the player at the edge of the screen would work.
- Next up in terms of the animations you could maybe stop the run animation faster. Not sure how you do it, so I can't really tell you the specifics.
- Some of the platforms are stretched. You typically don't do that with pixel art. Instead you can add two identical platforms next to each other and then you have a longer platform. If you have problems with collisions you can always parent the second platform to the first and a composite collider so they're considered one big collider.
- Also you get stuck if you fall to the side of a platform and hold movement keys.
In spite of all of this criticism, the game looks nice, controls are smooth. Good job!