The graphics gave me Minecraft flashbacks to getting chased by slimes in caves, which I found funny. Somehow I really liked the hazy gray sky in the game - it gave it this ethereal feeling that I liked, like being outside on a stormy afternoon and you can't see anything.
I thought it was an interesting spin that you can't make yourself warmer at all, making it a war of attrition, like how it would probably be in real life if you were in these conditions. I think having a timer makes sense since that's the only win condition here - holding out for as long as possible, so the player needs some way to know they've made it farther than last time. And I like the idea of having to choose between warming yourself or fending off attackers. It's an interesting strategy. Maybe a third element to that strategy is being able to find warmth, but it's not guaranteed, so you have to choose between leaving your green area to search for warmth or staying in it to guarantee you won't freeze as fast. Might involve some RNG though.