Took me a while to understand that you can use space to pick up stuff. It was a bit fiddly and it seems like holding space and running into things works the best.
I like the concept of the game with heat or ice applied to objects change their behaviour. The visuals are also pretty nice, it's a cool little art style.
What I didn't like was the music, not that the music itself is bad but the loop did not loop properly, it just stopped for a moment and began again. And it was a bit glitchy or tricky do let the character or items do what you and unfortunately you can use the items the wrong way and then you are stuck. And in some room transitions you added blocks that the player can't see so unless a player jumps when leaving the screen in these cases it's hard to understand why you can't proceed. See image below:
That you tried to explain the game inside of the game with tutorial panels on the wall was pretty neat.
Overall a nice game that could use some more polishing but when you don't run into a soft lock it's fun to solve the puzzles. Good job!