pretty good rough start. Not sure how far the concept can be taken but the off level gravity stuff is real fun and has a lot of potential for complicated levels i think.
Some small notes:
the game opens on not my primary monitor on a multi monitor setup
need some "i'm taking damage" feedback pretty badly. the enemies don't feel like they do enough damage either, they walk up to me then kinda just stand there. I'd also slow them down slightly, so it's more punishing when they catch up but they don't catch up so easily.
the projectile is very bright in the center of the screen on the first frame, flashbanging me and making it obvious the projectile isn't coming out of the gun but the camera. I suggest making a particle effect that comes out of the guns and fading in the bullet particle further away from the screen and trying to make the two effects look continuous.
The guns feel way too big on screen, but at the same time so few games do this that it's kind of a unique stylistic element. maybe you can get away with it, with a few more tweaks.
i get a really bad frame drop or hitch of some kind if im standing where the holy bomb goes off.