Very engaging entry, it's a promising concept with pleasing visuals, that needs a couple of more forgiving levels at the beginning. I nearly bounced off of it when I couldn't complete the second level after tutorial, but finally got it and was able to finish the whole thing.
You're already mentioning a better indication of lava flow in the description and that's definitely a good direction. Maybe trenches dug by the player could simply appear deeper/darker?
I really liked the final level where you're running away for most of it while things burn around you and then you save the day at the very end, it's a satisfying ending. Good job on your entry😊