It took me a while before I figured out where to go/how to play properly, but once I started picking up what it was putting down it was pretty fun. It needs to be treated as a stealth game - its far too difficult to win a firefight. Has a good FEAR-esque vibe to it when shooting starts though. I might "borrow" the jumping-whoosh/shake thing for my own jam game, its very well done! I haven't beaten the game, but I plan to go back to it later.
tip: F10 to reload if you accidentally trip the ending splash screen.