This game is incredibly cool. I would absolutely be in for seeing a more polished and expanded version of it. The idea of avoiding damage while maintaining your temperature is genius!
A couple scattered notes:
- I noticed some unavoidable damage in one or two places. I think I might have been able to avoid some of it with certain powerups, but I suspect there wasn't a guarantee I would see those powerups by that time.
- The powerups that negate temperature are a great idea, because they make it a very customizable experience. Having to choose between those and other items that increase your score or make the game easier in other ways is a great bit of decision-making to give the player. If the player always has the option to get more points instead of lowering the difficulty, this gives incentive to play "the hard way" for a better score.
- The game really hits its stride in stage 2. Maybe stage 1 could be a bit shorter and/or require a little more maneuvering from the player.
Fantastic work!