Fast but not perfect lighting

It's been a looong time since the last post, it's sort of a shame. But I've been so occupied with the lighting algorithm. There's not many articles online on how to code cell-based lighting. I've had unworking solutions, almost perfect but slow solutions, and now I have an algorithm that's fast and almost perfect. Almost :\. It's especially fast on PC and playable on Android.

Lighting code is a bit nasty, but after I clean it up and other stuff maybe I'll release it asking for a better solution.