Very unique concept!! Love the idea!! I am not good at shooters and terrible at FPS (first person anything, actually, i get motion sickness, although i managed quite well for the little time i played this one). I played it twice, the first time I had no idea about the rhythm based shooting, so I didn't enjoy it much. Then I came back here and found the instructions in your page. I definitely think instructions should be in game. I had an issue that's been already mentioned, that I never managed to get out of the first room. I had already read your comment about how some of the mobs seem to clip somewhere, but gave it a good 5 minutes or so, walking around pretty much everywhere, and nothing happened. Except at some point, when i was facing a wall, very close to it, and I saw the red overlay and noticed losing a bit of HP. I turned around and couldn't see anyone. Other than that, I think this was a lot of fun and, as I said, very original!!