BALL STUCK! BALL STUCK! Just kidding, I did it on purpose.

I like how the movement is unique.

Neither the spikes nor the slimes could hurt me for some reason, unfortunately. Also, I could somewhat cheese it by launching myself through walls in order to reach orbs.

The bullets being physics-based doesn't seem to hinder the player much -- so what if they can push some boxes around? If you make it such that you're meant to avoid toppling the boxes (and your bullets have much more inertia/mass than you so that you don't accidentally topple them while moving around), I think it will be more interesting. Or maybe the bullets should propel the player backwards, hindering their movement, like this godawful chaingun.

This game lives and dies by the bounce, you love it or you don't. I was interested by the bouncing mechanic, and the shooting being faster via your mouse cursor's distance was interesting as well. It was very common to clip through walls, which I first treated as a bug, than an unintended mechanic, and then a gameplay feature, because for some orbs, there is no other way to get there. Also, I don't know if it was my screen, but the darkness felt way too dark. I was constantly squinting at my ball glow trying to figure out what a surface was, and then combined with wonky bounces it can wear on patience. The background ambience and lights with the cave background was good, I liked it very much. Good job!