This is certainly on the more challenging end of the spectrum. While I get how the game is meant to be intense and leaves little window for reflection, it would honestly feel fairer to have the balls either change color or be highlighted in some way because honestly, having to figure out when is the ball clickable feels a bit like a redundant difficulty to me. Also, a bit more reaction on destroying a ball would definitely boost the experience, as I understood this game is meant to have a cheery, sporty vibe with vividness to it, even just a screen shake would be enough.