Really enjoyed the work, your theme is perfect for the theme. Makes me wonder have you worked as an engineer in for transportation system? Only they suffer enough to think of a temperature game this perfect. Had a good feeling about it as it was related somewhat to work
1. The 4th one was a little difficult specially because I got tired of reading the instructions of the window and how it works. Maybe there is a way around for not so much text.
2. Only thing I saw was the crates getting stuck between doors when they are opening and closing. Not sure if it was intended though as it was not game breaking. But this could an added mechanic to keep the door open.
3. 4th level with the window mechanic.
4. Loved it! I think a little added post processing on lights ( maybe increasing ambient occlusion) can help with feeling a little cold on the colder sections and adding some volumetric effects on the hot section. But visuals are amazing no doubt!