This is really cool (no pun intended). I enjoyed planning how far to drive before running back to shelter.
I never worked out how to eat food, so I got through the game by loading up entirely on fuel, and sacrificing the operators. After clearing the game, I checked the start again, and the button was mentioned in the tutorial. It seems like an important point, so maybe make the tutorial a bit briefer, and/or put a button prompt on the HUD.
The deforming snow is really impressive, and the snow material is also very nice. I think the level design might benefit from more variety of paths. For example, maybe there could be sheltered paths which are easier to walk, but which are too narrow to drive through. Or windy areas where health drops much faster out of the plow. Strategically planning routes was very fun, so I feel you should lean into that more, if you continue developing this.
Overall, a very nice concept, and well executed!