You should also take into consideration performance of the game. It takes up almost 100% of GPU. You need to lock framerate. One way of doing it is by enabling VSync or locking to 30 or 60 fps. There are also other ways of optimising.

Overall, the game looks awesome. It's interesting to explore rooms, though I'm not a fun of maze thing :)

Very sharp and cohesive visual design (marred slightly by being too dark). Excellent sound effects, from the breathing to the doors to the different footfalls depending on the floor material.

I tried beating this 4 times before giving up. Ultimately, what defeated me was my inability to navigate the maze before running out of oxygen. Maybe some additional navigational aides would have helped.

it doesn't start