A bit basic, but not bad.
Theme Implementation:
It's there, but it might as well have been a timer.
Special Feature Implementation:
I had no idea clocks combat hypothermia :0.
Fun Factor:
A little repetitive. It might have been a little more fun if the timer moved quicker? I don't know, just thinking. Oh yeah, and I thought the mouse sensitivity was way too high.
Gameplay:
Slow and steady.
Audio:
The footsteps start glitching after a while for me.
Graphics:
Standard Unity Skybox; standard Unity particles; a big white square floating in the middle of nowhere; the clocks look nice, though.