I think I found a bug: on day 1, I got curious, explored the desert, and found a note on another bunker. On day 2 nothing happened, I wasn't prompted to do anything, waited a bit, and was prompted to sleep. I assume I was meant to try to meet the person on that bunker and find the note? I suppose it's a more than understandable glitch given the time given.

That said, I still felt like the game lacked a lot of story. The protagonist's tiny, one-room bunker seems meant to be claustrophobic and sad, but together with the lack of expanding upon the plot (only mentioned in the description) it just made me confused. Where does the protagonist get food?  What is the windmaker for? Does it create electricity? Food? Does it just fight off sandstorms? Why do sandstorms matter underground? Day 3 felt like one big letdown, as the protagonist's reaction to the windmaker's malfunction made me just lose interest in the concept, as the worldbuilding felt empty.

This game seems like it wants to be a walking sim- carried by the plot, without much challenge in the gameplay, only an interesting world to explore. The problem was, there just wasn't a plot.

I liked the idea with the dust storms and the windmill. It fits the horror theme well, but I don't think it fits the isolation theme. 

I learned more about the lore from the description than from the game itself. Because there is no narrative in the game, the player has to perform random actions that have little basis in the story. As long as I understand what's going on and have a strong goal, I won't close the game.

The hero gets tired of doing nothing for only 1 min. Think of other reasons to direct the player to a specific place or to do a specific action. For example, the phrase "I'm scared, I want to go back to the bunker" would eliminate this ridiculous situation.

Level design should make an intuitive walkthrough. It is very easy to get lost in the fog and not very interesting to walk knowing that almost all the space is occupied by emptiness. In such places you need some landmarks, such as connected flags, a row of bushes or footprints of the main character showing the way from the bunker to the windmill and back.

Readability always comes first for the font. I couldn't read the note. Sacrifice style and make the font standard if you're not sure if the player can read your text. I'm not saying about overall 3d style here since it's a jam game and getting correct 3d models could be really tough task.

Still think the concept is nice and you can make more of it. Good luck.