Neat little platformer. I was surprised there are relatively few platformers, but this one incorporates the theme better than others I've seen. It's kind of a nice game flow to make it to the next fire and stay in safety for a bit. Sometimes this waiting felt a bit long to me, I would suggest make the temperature go up faster if you're staying near fire :)
One time I turned to ice and didn't know why, I think the collision box was maybe a bit big and I hit the spikes when visually I wasn't touching them. Also in one of the gaps I could stand on the spikes and they didn't turn me to ice!
For a solo project in a short game jam, not bad mate!