Just wanted to drop in and remark on how elegant this design is. For my first game jam I put together a very similar concept, but this is leagues more fun just because it's much simpler - I really dig the timing aspect of the launch (my game had a slider to adjust), and moving the hole to increase difficulty is an excellent idea.
My only criticism is that level 5 is a significant difficulty spike: I'd have appreciated a smoother ramp up to that. I'd love to see an expanded version with different planets (maybe some bounce the ball off, so you need to ping-pong through levels) and balls (heavier variants have more momentum but are tough to squeeze through small gaps).
Fantastic work, especially for 48hrs.