It's very polished in terms of production and presentation. I would have given the presentation 5 stars had the audio not been pre-existing assets. The little bit of homage to Flappy Bird was nice, by the way.
The core idea and mechanics work very well, but the hero of the show is the level design ideas and layout, which do an excellent job of showcasing both the consequences and the possibilities of the core mechanic. That being said, the placement and spacing in many levels are very rigid, especially since aiming is a bit tough to gauge (and collision is not that forgiving either).
I would have given the fun factor 4 stars if not for the inability to understand how the ball's momentum works, in the face of the tight-rope precision the game demands. While I can somewhat get over the trajectory being a bit tough to gauge sometimes, the momentum and acceleration feel a bit erratic at its limits. When a level's solution/nugget requires precise execution, this feels rather unfair or at least poorly conveyed. When the level's spacing and placements are not so strict, however, this is a mild matter and is barely noticeable.
Since the level designs are inspired and have a puzzle-y nature to them, the strict execution fights against it. When the player reaches the correct solution in their mind but has to retry >50 times due to stringent execution precision, those next 50+ attempts simply become undue punishment. Fix this, and the game experience overall could probably have a proper price tag on a storefront, given enough content and if the level design remains just as inspired throughout.
Gripes and compliments aside, it's also worth noting that the core idea itself can probably be explored further. For instance, there could be other game objects in the level aside from walls and button-recharges. Look no further than Pinball and The Incredible Machine games for inspiration on this. Then again, perhaps I simply did not get far enough to encounter them (stopped at level 8 due to the momentum factor).
In all a great entry, and I certainly hope it gets taken further. The potential is certainly there. Great work!