Waddahecc, this is so well made! I love the little introduction in the beginning, which makes it really easy to pick up and now what to do, while the challenge comes from the game itself.
I had a little bug, where in the beginning it wouldn't let me fill the bucket at the bottom water in the first level, but everywhere else, and after the first initial input, it worked at the bottom, too.
It just feels very thought through. Especially because of mechanics like that the fire can't go where the land is already burned, so that you can make "walls" to prevent further spreading.
Very fun! :) Can recommend