Short but very enjoyable. Took me a bit to get used to the fast-pased action (deaths and all) but I liked it. The resizing of the room was an interesting twist to spice things up. The story was intriguing and I think you can expand on this with more places, enemies, abilities, weapons and the sorts. This can turn into a great story.
All the best.
P.S. The flies, man. Get a damn bug spray!