it is very difficult to hit the ball where you want it. the visual part is well done, but the gameplay suffers.

Good gameplay.
I recommend that you don't let the player die since he hasn't pressed anything. You may have the character hovering in the air and tell the player to press the spacebar first and have the character float and fall. Players will also be able to place a hand on the keyboard to control correctly.

Great game. good use of theme

Interesting gameplay, matching graphics and sound, easy controls.

Though it feels a bit stiff  everywhere, and it is a little short for my taste