Nice, short cute game. Lots of minor bugs though.
I explained a bit at the end of my stream, but the fire spirit thing feels a bit unintuitive to me, though I do kind of understand why you wouldn't want to have that ability at the start from a balance/progression perspective.
A few areas are just kind of confusing due to the coloration and design.
Probably would be a good idea if you suggested players to save before the boss since otherwise the player could theoretically get stuck. (Since the hints for the first part of the boss fight are in the previous room).
Initial load takes a long time, not sure if you can fix that given how the game is packed, but something to consider.
The orb in the lake part was kind of confusing until the boss hit me after, but I can imagine it being confusing to most players.
The boss flames thing was kind of confusing since it looked like that is what your ability was for, but it isn't.
I did notice a few spots with potentials for bugs, but I wasn't particularly trying to go out of my way to find bugs.