This is actually my favorite implementation of the theme in this jam. Only if you did a little bit more polish and improvement on the art. The platformer feels nice and I love the main mechanic. Though on the other hand, I am not a fan of the music and the art. The art could be a lot better with some tone improvements(no need to even greatly change the sprites), Here is the things I think you should do after the Jam ends

Recolor the dirt assets to be a bit darker red on the upper part and another hue close to red in the lover part to give the impression that the world around you is hot and you are melting. Also add corners to the blocks at the corners to make the assets blind into the environment and not just look like blocks randomly put together(you can google any platformer asset and see what I mean)

Change the background to a lighter hue of red different from the blocks and with the world particles you have already added it will look more majestic

Anyways  amazing job, I just hope you can improve your art, because you have the mind to acquire great ideas! 

This game is brilliant and deserves more views and plays! I loved the graphics and systems where you had to be a certain size to move through platforms. I'm giving top marks for originality and theme!

Fun concept! Think the fire was a little glitchy for me, but I liked the puzzles. Great work!