Really nice and satisfying game. A simple mechanic well executed. You judged the point at which you see the next rock really well.
Pacing was good for us testing but maybe lower how the game accelerates. Or, you could add a streamer mode for a longer more nail-biting highscore run.
At first the sound effect gave me a headache but it was satisfying too. It makes sense if you imagine a metal grappling hook. Perhaps add water splash to the same sound file.
The screenshot doesn't do it justice. I didn't do one this time but it's probably important to get more clicks. Something more zoomed in as the main one and I see people using animated gifs for the rest.