This is very nicely done, the temperature mechanics is really innovative! And having it affect the environment and the character too makes it challenging.
But just one small problem had been how insanely fast and overwhelming the amount of enemies are in nearly every map. It's about as hard to navigate as a high-frequency random encounter.
Still though, I like it. The map design is awesome, the premise makes me curious and I would come back again to see till the end of it.
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Glad you liked it! Yes, I did wonder at the enemy density, especially in more cramped maps. Well, at least you can try and get around them (except for the bats, which are too fast to dodge), and they stay gone once you fight them. So I'll keep that in mind and, after some more playtesting and opinions, see if I might adjust it.