Really great! This was way better than what I thought after seeing the development process.
It actually had decent level design (unlike my entry), well picked sound effects and exceptionally good visuals for a game made with only basic shapes. I really liked the random creepy sound effects that played in the rooms as they made me think that I was about to enter a chase sequence :D
The game could use some extra ambient sound effects (like cave ambience or something similar) and the cold mechanic felt a bit disconnected as it only slowed down the player with no real effect to the gameplay, but other than that, good job! I feel like this game is going to be in the top 3.