Thank you for playing. I updated the description and also uploaded a video demonstrating the intended experience.
Yes, I made a huge mistake putting in unclear and even downright wrong instructions. The reason enemies have quite a lot of health is to make up for the potential damage multiplier which gradually increases up to x1.5 if the player can maintain the heat gauge above the player. As a result, it is possible that the player could finish the game within 90 seconds or less as presented in the video.
I would be really happy if you could watch the video and perhaps give me another chance and provide feedback based on the video or even another play-through if you wish.