The Art
The bright blue floor is a bit straining to look at while moving and although I like the colors for the enemies, their transparent look makes them hard to see. I love the visual style a lot and I think the biggest improvement would be to change the floor color. It makes the enemies and half the magic circle on the gun difficult to see.
The Music
I enjoy the music
Other Feedback
The gameplay is a little confusing. It feels like the enemies are either spawning right on top of me or they are moving too fast for me to get distance away from them. I'm not sure if I've killed them or not. A more readable confirmation sound effect or visual effect could be added.
The power-up options show pop up as I'm still shooting so I end up clicking one without having a chance to read it.
The movement feels good while the aiming and shooting are very satisfying. I don't have a lot of experience with survivors-like games but I'm confident that this would get me hooked.