That was really really awesome! I loved the different types of monsters and how they played off each other, like how quicksand you needed to run over but the worm senses you running. I also liked how the flashlight was just a flash instead of being either constantly on or off. My favorite monster was the super bright and hot light monster. That one made sense right off the bat and I had a fun time dodging behind the pillars while running over the quick sand.
The quicksand was also pretty cool programmatically, I was surprised to see it create a hole beneath the player.