I like the idea of the sun burning the world every day, and the music ramping up when the sun rises was nice. It would be cool if the shelter turned brown and burnt after each day, just something to indicate why the shelter doesn't last more than a day.
I really enjoyed the idea of moving the wall to access different parts of the level. I did find a little bug where you can get stuck behind the right portal on the second floor of the first level if the divider is pushed to the left, but overall, it's a cool game! The music was also really nice!