I haven't had this much fun with physics in a long time! This felt like it came out of Garry's Mod. And it's awesome!
I spent quite some time exploring your mechanics of black holes and experimenting with chaining them. It was great. And seeing the cat spinning as it gets flinged is hilarious! Also I loved the assisting purpose of flower pots, very creative!
Overall, I loved this game and hope to see more in the future.
P. S. that menu / last level music is sick. :D