As a Kerbal Space Program fan, I really like it. Btw, you can achieve stable orbit around black hole in level 3
Viewing post in Moon Golf jam comments
Well done for achieving an orbit, that's super cool! It's an idea I toyed with at the start. I wanted players to have to take more than 1 shot to reach the black hole by first being captured by another planet midway. I knew achieving that for the player would require WAAAY too much precision, so I intended to have the physics cheat a bit and have the moon enter orbit when it was "close enough". However after a while of trying to design and implement this feature I decided to scrap it because it seemed to be overscoping for the Jam. To be honest with the jam over I think I can think of a pretty simple way to achieve that now. I intend to continue development on this game so it may be something I add, if it turns out to be fun. At the very least having an achievement or something for achieving a stable orbit would be cool. Also a big fan of KSP, as you might be able to tell.
I don't think it will work, because you need to gain speed or loose speed to achive a stable orbit, which means you need a way to affect the moon's speed only one time, and then do not affect it anymore. In third level you can do this by affecting moon's speed once at the start.
A while ago I made a prototype similar to your game, where you need to build you rocket and fly it to the finish while being affected by gravity from planets(kinda like "Bad piggies" and "Angry birds Space" mashup), real life gravity formula do not work well, even KSP uses the "sphere of influence", so cheating with gravity was essential.
Also I can help you with the visuals if you want to release your game(I have some skills in pixel art)