I've played this yesterday and today again, because I didn't have the time to make a comment, but here I am. The visuals are really interesting, and the idea by itself is really cool. However, playing today I couldn't fire with left click for some reason, space bar saved me but the control layout feels a bit weird with it, maybe Z for shooting and arrow keys would have been better. Also, when changing weapons, I don't see too much feedback, so I'm shooting with a weapon then BAM, another one pops up like, with no room for strategy. A timer and some sound/visual feedback would be way nicer.
The default SFX volume could have been a little been lower because it feels obnoxious at times, but I'm glad there's a slider to change it.