Compared to other games that are all trying to avoid the black hole or use gravity to destroy the player, you have made gravity to both destroy the player and the enemies. What a unique approach and fun mechanism!
I would say the movements sometimes are a bit chaotic and makes it difficult and a little bit frustrating, but I have to admit that watching the chaotic behaviour is one of the most important elements of this game. Great work! (btw I beat the game, yay!)