Wow, that is a very interesting concept. I've seen meta-type games like this before, but I don't think I've ever seen one that had unique windows for each room.
My only issues would be: on my 27" monitor at 2k resolution, the windows were a bit too tiny for my liking, it was hard to see, and I didn't always understand why I was dying.
Regardless, the art was fantastic, the audio worked well with the retro theme, the basic "mechanic" with the room crawling was, by itself, very entertaining, and the actual combat felt nice to play with.
Very cool game.