good implementation of the lasers, pretty fun, although more of a tech demo than a puzzle game, which is fine. I actually wonder if there is a cap to the difficulty of puzzles because it seems like it would always be straightforward to solve any mirror puzzle like this with the singular mechanic.
a bunch of suggestions have already been mentioned (minimap, multi-coloured lasers, snapping)
I'd note multi-coloured lasers dont necessarily need a new mechanic, just do it for organization (although youd probably want a new mechanic)
A thing to experiment with would be remotely controlling the laser from anywhere (i have no idea if this would feel good or not but it would save some tedium. Also I think you could probably get away with lasers always firing, no need to toggle on/off with the singular mechanic)
It is a step up from the mirror puzzles in mournings end part II on runescape lol.
grats on the release