Managed to beat all the levels. Haven't collected any of the apples though. This has been really fun.
I feel like for now there is no downside to hold the mouse button down again as soon as you hit the ball. Perhaps it would reward more precise timing if you lose strength for slowing down the time for too long or if there is a limit to how long you can slow down time? But that might make the game more difficult that it already is.
Still, the way it is, it's already a very enjoyable game. Great work!