Great work, it really captured the feel that I was hoping for.
The controls are a bit weird. The menu and inventory screen could not be accessed from my xbox controller so I had to use the keyboard for those two things.
A few of the camera angles allowed you to go out of sight which was a little annoying.
On my first playthrough I saved and quit and then came back, this seems to have reset some stats on the end screen because it said I'd only taken 8 minutes to beat it but it must have been at least half an hour. It also said I'd never been discovered.
The fps mode is really nice, sadly not reaching the 7 minute deadline on the second playthrough I lack the patience to keep hunting for that last unlockable =P