Overall good game. Controls more suitable for mobile then for web.
1. When I rotating mirrors spectre rays not always mirrored. I mean I rotate but ray no appear in right direction. Then I repeat and it appear as needed. Not always but several times through first levels it was. I understood what it was - you did two sided mirror. One side work and other not. But sides looks the same. So it feels like bug. Do visible and obvious difference if they work so different.
2. Rotating buttons in bottom of the screen a bit strange for me. It works but I thought all tools for moving and rotating will be in one place or near.
3. Select one mirror from level start. So player will see that something can be moved.
4. When some tool placed before other tool it can't be moved through. It's not cool and useless. Player just need to do more useless moves. The same with walls and tools. This became distract from level 11-12.
5. I don't like green tool with rotating pipe. It's not obvious and intuitive. Too hard for me.
6. Graphics are ok but not perfect. Light balls looks like basketball balls. I can suggest something like coloured glass. Mirror not looks like mirror - no glare. Maybe some triangle peace of glass will work better - so you can see light ray moving through.
So this game need more polishing to be good.
Good luck.