This was super cool!
The concept was new and interesting, and I always enjoy seeing a 2D game utilize lighting.
I think one suggestion I would have would be to have lighting work more on a tile-to-tile basis, so entire tiles would receive some amount of light. Towards the last few levels, I found myself struggling to see where to go next after leaving the torch by a cross. So like, half of the tile would be obscured by complete darkness, which added an arbitrary difficulty. I think if even a small part of the tile should be illuminated, the entire tile should be illuminated with the same amount of light (that way dim tiles would remain dim and so on). I hope that's not confusing, haha.
Interesting concept, though!