Mirrors are supposed to allow you to redirect your light, and can be powered up to boost the light production after reflection. Whether that works as intended is a different story. I might be just taking this project down as I haven't worked on it in a while.
maybe don't? it's a key component of this:: https://semenar.itch.io/incremental-game-jam-game
Yep, noticed that! I've just decided today to try and restart making little games like this, but if I want to go back to this idea, I'll make a whole new game instead of messing with this one. Still crazy that Semenar decided to include this broken mess in something else, but hey. That's the charm of these sorts of things, right? XD