I was playing on a laptop with a mouse plugged in, dragging and releasing with the usb mouse didn't trigger a gravity change, but it did play the sound effect and show the cooldown. Only if I dragged with the trackpad. Seems like a weird engine bug or maybe even just my laptop being weird idk.
The footstep sound is bugged to play every frame, which detracted from the otherwise good audio. I found it quite unforgiving and punishing at the beginning, and too easy once you have a few crystals. I really like the lighting and overall art style, nice work.
Gameplay and art was very reminiscent of portal, mechanics were interesting, although slightly sluggish and frustrating at times, the pool trap at the end of level CII is unforgivable.