Solid game! Everything worked as expected, no cheesing by moving faster on diagonal movements. All good stuff. I didn't have any trouble, only a few instances where the RNG knocked me some balls I couldn't reach (I kept getting tennis comparisons during the game for some reason lol)
Only small suggestions are that as the game is keyboard only the next level buttons could be controlled by keyboard too. Also maybe the speed could be optionally tweaked via difficulty modes (I'm a semi-old codger but I could have taken 25% faster speed even on the last level without too much stress)