Visuals - good, apart from the monster looking rather blocky compared to everything else. I also really liked the light.
Audio - also good, unfortunately the eerie music didn't loop so it played just once.
Theme - I think the game fits the theme pretty well, though maybe it would have been better with less oxygen as I found the exit with more than half remaining.
Gameplay - simple but fun.
Enjoyment - very fun overall, lacking a bit of polish