The concept of rotating the space around was a really creative use of the "One Room" theme! I'd love to see an expansion of this mechanic, both with unique room geometry as well as attacks that make use of the rotation ability!
As it is currently, there isn't much need for manual level rotation in combat. You could use level features such as destructible cover or enemies that are vulnerable from different angles.
I could also imagine a boss attack where your current floor is filled with some telegraphed hazard, and you need to rotate the room to avoid it. Any excuse to give the players some excuse to engage with the mechanic of rotation!
Also, I really appreciate how your enemies with projectiles clearly telegraph when they're about to fire. These types of affordances are often forgotten under time pressure, but benefit the overall feel of the game.
Well done!