Interesting mechanic. It fits very well with the jam. I will say, the steel looked very close to the glass at a glance. The audio was done well, plenty of SFX, and nice music. The controls felt nice on the keyboard and mouse. I liked that you could chain the transformations; additionally, it's a cool touch that the light form travels faster than sound. The environments are aesthetically pleasing, as well.
Cool submission.
I actually saw this game way earlier, before realizing I had review games in my queue. Still, I felt I had to come back to it later.