I'm impressed by the atmosphere it creates with so few sprites and artwork. It's working off the Wolfenstein model, but it manages to do its own thing and not feel limited by that design aesthetic.
My only issue was the control scheme and the framerate. It was a tad slow and jerky, and made me a bit ill having to slowly turn my head as I was. Makes circle-strafing a bit messy. LOL
Even with that said, though, I love the concept. And the art design for the monsters and the keyhole doors are great.