Incredibly addictive! I could see people getting hooked to this game for days on end, trying to beat their own high score again and again. You've done a lot with very little, and details like the number shake and particles, the stretch and squash of the ball, and the leaning of the platform make it very satisfying to play. I think that's essential to making a simple game focused entirely on a single game loop like this enjoyable for a long time. It did take me a while to figure out how momentum's built, but besides that it's a fun mechanic.