Creative idea, really good sounds, and ambient. I didn't like the keyboard controls at all, they were definitely not intuitive, I would love to use the mouse for the inventory and menus, maybe using the L/R clicks instead of J and K for the ergonomic position of hands. The other thing that I notice was the lag when an enemy hits you. I think that could be because you don't have the Sound Effect pre loaded in the system, and the program is looking and reading the file from the disk every time an enemy hits you (I am not sure, but I mention it if it helps :) )
Nice work!