Awesome game! I loved so much here, the art style is super cute and the stylized water and fire are great. The music is really catchy and I think the concept is super smart! I can see this being a really fun puzzle platformer when fully fleshed out.
Some small nitpicky things. I think some things can move a bit faster. For example, the fire spread and pushing obstacles felt a little slow at times and was a little frustrating when having to replay levels to wait for that. I would also suggest looking at this thread about platformer game feel by the creator of Celeste. Adding a couple of these things like buffered jumping and coyote time would make the character feel that much better to control.
https://mobile.twitter.com/MaddyThorson/status/1238338574220546049
I'm not trying to be too mean, I had a lot of fun playing it and I think this could be a really awesome game. Great job!