Really interesting concept and love the detail of you explaining the science behind it! I think this mechanic makes for some really interesting level design & definitely matches the theme perfectly. I enjoyed the humorous dialogue at the beginning and liked how it was integrated as a clear and helpful tutorial. Background music is great. I also appreciated the small visual details like his expression changing when heating up too much & the balloon string was neat.
Unfortunately the character got stuck at the slope and I couldn't progress. Great job overall though, would be keen to play the rest of the levels after the jam when this is fixed!