Interesting physics based mechanics.
I'll get the issues out of the way first, the game feels a bit confusing at first glance with the shots that can self inflict damage when they orbit inside the arena, and some of the enemy patterns feel a bit eratic (mostly the rocket looking ones) zooming around at random.
Other than that the game is great, with the orbit mechanics, the hp recovery if you score a kill with the black hole, i particularily liked the fact that if you time it well the black hole can serve as protection by absorbing all bullets of a complicated pattern right as they're shot out XD
Once i got past the confusing begining to learn the mechanics, i had fun playing.
Good job to the team :)