Um, what am I supposed to do? Some gameplay instructions and controls on this page would help a lot.

I think this is a creative take on the theme. I also found it fun to mess around with the planet's orbits. However, I found it easier to do nothing in order to make the planets pass "in the right order" as the black hole is a little hard to control.

Nice game! The idea was really innovative and implements the theme in a pretty creative way. I feel like I understand what I'm supposed to be doing and I feel like it's possible, but I found it pretty challenging. I keep getting planets where I think they should be, but their speed keeps getting increased in addition to changing their orbit with the black hole, so they quickly get out of alignment. Often, I accidentally send them off screen where I don't think I'll ever see them again. Still though, great job on the graphics, and really nice concept and mechanics. I also take my hat off to you for using Pygame! Overall, well done!