I like the arena spinning mechanic, I think you implemented it really well. The little time stop while spinning and the ability to slow and speed up your fall gives the player a lot of control and just makes it feels great to use.
My main critique would be that the melee doesn't feel rewarding enough to use considering how risky it is to get that close to the boss. The buff it offers isn't all that noticeable, and it's generally a lot safer to use just the laser, since there's really no drawback to playing that way.
Also, I appreciate that you included key rebinding, I find it more natural to view clockwise as right and counterclockwise as left (should've included rebinding in my game lol).
Game's fun, I enjoyed both boss fights, and I like the premise that you're repairing robots that are trying to kill you. Nice work :)