Started out great, The B01 level perspective change was a bit off throwing. Then control response vanished on the eye level. And it all went to shit entirely when I pressed pause. I was spotted and died before the pause kicked in, and when it did kick in, the pause layer was present, but the game continued behind it. Which has resulted in a gunshot every few seconds as I write this review.
Personally I'd call this a beta test and send it back into development to work out the bugs.