Nice execution of the Jam’s theme. The game fells nicely polished. I think the bloom goes somewhat against the 3-color restriction, but that’s probably a matter of opinion.
I don’t like that the game completely captures the mouse. I feel that not knowing the exact mouse position makes the game somewhat awkward to control, as it becomes less clear how much the direction arrow changes under mouse movement. But the level design seems to require such detailed controls. (I think this problem could be mitigated by centering the ball in the center of the screen, and then moving the map around it. In this way, the relative position of the ball and the mouse pointer doesn’t change while the ball is moving.)