Intriguing concept! I had to read your ideation document to have a better understanding of the game, because the "how to play the game" button didn't show me anything. (I only had texts about the controls while playing)
The tetris-like blocks gave me the impression that this would be about clearing lines and avoiding having too many things piled up like in regular Tetris, but this was actually the opposite. The physics of the blocks are quite fun, but the temperature meter never went up in my case, no matter what I did on screen. Also, not having a grid and not knowing how wide and high I could go while using blocks was a bit confusing to me (but I guess I've played too much Tetris). I'm not sure if this was intentional or not but I didn't notice much of a difference between the types of blocks (as mentioned in the ideation doc).