I'm a sucker for this aesthetics, so I'm giving you 5 stars on the graphics, I also thing the ambiance is well done, but I don't know if it was intended or not but the audio sounds strange(?), like, when someone blows air into a mic(?) or like really old videogames, although as I said, it kinda added to the game's ambiance. I also got some glitches like the others mention, I never knew how the monster is supposed to behave, BUT it let me take a closer look at it, and I liked the design, specially the animation and the texture.
I do think it would be worth to polish the game further and maybe expand it a bit, for a week of work it's good and I believe you have something interesting here.