Love the visuals, but my favorites are definitely the enemies and the key. Regarding the gameplay, I fell in love with the temperature system at first sight, and I think that small debuffs might work better than directly losing HP. Other than that, there were a lot of HP boxes but very few ammo boxes — after I shot a whole magazine at an enemy, I basically found two keys faster than ammo.
It’s hard for me to give fully honest advice because the scope was quite big, especially for a game jam. Maybe adding delivery/courier-style missions or a “find a package and return it” mechanic would be a good change for the game. Something like gathering resources and earning a rank — if it’s too cold or too hot, the delivery takes some damage. This would also make the game more replayable and longer. At the end i need to mention that sound design was cool and really made me engaged in this simple game 😄.