Really nice entry! I like the idea of using fire as a mechanic, everyone instinvitely knows "fire bad" XD
The platforming was pretty decent, not too easy but not too difficult as well, and I think I found someone else who uses darkness as a mechanic too, haha.
The art and music were really good as well, however I was playing with headphones and it seems like you are using AudioStreamPlayer2D for the music? It is positional audio, meaning at times the music was only in one ear. Very simple fix and no big deal.
Overall a really nice entry, good work!