Personally, I find the throw-able objects to be too rare. Furthermore, as you progress in the game, it becomes really slow just to go out to grab something and go back to the black hole.
Other than that, the main concept is neat and is pretty creative, and has the enemy variety it needs. Good job! :)
P.S. Since, for some strange reason, itch.io refuses to show our submission under my comments, so: https://itch.io/jam/brackeys-3/rate/569748