Simple but nice concept. The game starts at a fair difficulty, but I wasn't able to clear level 3. It seems the platform is too high to jump on top and I can't seem to be able to use any skill to help me there.
It'd be nice to have WASD as an option for the control schemes (my keyboard has no arrow keys, only if I hold FN, so I had to plug in another one to be able to play properly)
A background music and a jump/dash sound would also be great.
That being said, the character controller is solid, and I like the wavy effect on the bottom of the screen and the stars. Good job, keep at it!
PS: After playing some more, I learned a glitch trick that allowed me to finish all levels (the speedrunner in me had to try lol). Depending on how you dash against the wall, if you press right and then left at the right height, you can get to the end of the level. Here's a gif: