Nice simple game, thanks for sharing your thoughts on YouTube.
The juice is good and it feels polished, the numbers going up is just satisfying enough for the ~5 minute play time. In terms of game feel, I would have two pieces of feedback.
1. It feels bad to hit an "almost destroyed" block and bounce off, especially if you just hit a corner of one that you can barely see. Ideally you would "smash through" blocks that are almost destroyed, i.e. the amount of reaction force that a block puts on the player would scale down with the health of the block.
2. It was always a bit of a surprise when a run ended and snapped back to the shop screen; it feels jarring and sudden. I think this is a combination of a few things: the health decreases super-linearly (the deeper blocks deal exponentially more damage, so you can go from 40% to 0% in no time at all), the health bar isn't very prominent (I would maybe make the player character flash or show visually when close to death), and there's no animation on death, it instantly goes to the shop (I would add a short death animation so you realize what's happening).