First of all, well done for your submission. The design looks relatively good. And the color palette is pleasant to look at.
But I found the game too difficult to play. The ball is very fast, he moves with unexpected movements and has a lot of life. Plus the Z and X key positions don't feel comfortable And I had trouble hitting the ball and jumping at the same time.
Overall with a little more work it can be a really good game. Keep it up :)