The pitch shift on the sound to indicate your score is a cool touch. The camera's field of view makes alignment difficult, as does the sudden loss of all horizontal motion. A position curve to give some sense of that momentum shift could do wonders for the feel of the game as well as the brain's ability to align the magnets.
Also, it would be nice to have a prompt to submit to the leaderboard rather than the post being automatic.
The minimalist aesthetic is nice. Perhaps tying the magnet color palette into the UI would make it feel more cohesive.