There's a lot to like here! I'm going to say some critical things, but please understand that's because I think this is at its heart a very good game with a lot of promise. Basically, the premise is good, and the puzzles are quite solid in conception.
I admit I didn't love the movement; I found it kind of jerky and offputting. That might just be me. A few more objective issues (disclaimer: I was playing on the web, not the downloaded version):
- It's very dark. I get that it's about light, so it's bound to be overall dark so that the light stands out, but it was often very hard to see the tracks. More than once I was slowed down on a puzzle by not even realizing something could be pushed. (Similarly, until the light hits it, I often couldn't tell what direction a mirror was facing.)
- I never got a sense of the colors; even the room with the four color targets ended up being much more trial-and-error than anything principled, because on the one hand I couldn't tell what color a target expected (especially between "green" and "yellow"), and on the other I couldn't really tell what effect an orb was going to have.
- In the place with the two side rooms, there wasn't any good visual indication that lighting the target accomplished anything; I had to go back to the main room to see an effect. (Note: I was also playing with the sound off; there might have been an audio cue. Even so, you can't count on all your players using sound.)
But the mechanics are solid and the exploration aspect is a good one. Looking forward to seeing where this goes!