Beautiful art style and very relevant to the theme of this game jam! I definitely enjoy the twist of adding fire spirits to make the game's pacing faster.
1) A minor thing that hindered with the UX is when I highlight an upgrade, it blocks the upgrade above it. Making the navigation a little awkward.
2) Another thing that could be enhanced is allowing the player to end the spreading fire section early. There were times when I knew I had exhausted all options of igniting the right side, but I still had to wait for the rest to finish. (Maybe the end button calls a downpour and puts out all the fire).
Overall, it's a very well-polished game with amazing graphics! I look forward to more levels and more interesting mechanisms.