as others have said, the movement and collisions need some work as you feel very floaty/slippery and you clip into walls then get teleported out.
for the movement try slowing the acceleration and lowering the max speed, and make the deceleration when you let go more powerful as well as making it not immediately swap directions when the opposite key is pressed, instead have the character decelerate and accelerate(quickly) as that can also help with the feeling of the movement which is important in a game like this where movement is the main mechanic
the map design needs some works as well as in some parts its possible to get stuck and you can't progress or backtrack.
however I did really like the fact that when you jumped on a enemy it does a jump, tho it does need some work as you can go flying off the map using the ball piles that get created.