Wow, this is a really addicting game. The atmosphere is unique and there's some story to go with it. The spinning mechanic is very satisfying because mowing down enemies is what a bullet heaven is all about. The controls are responsive and there's even the option to remove spinning the mouse. I'm sure a lot of playtesting went into this.
The second boss was a bit confusing because I was not sure where it's hitbox was. The last boss was kind of hard to hit because of all the body blocking by minions.