Great entry. Nice puzzles too! I done all, but blue... I am not sure about what to do with blue. I think its patroles around and you can hide, but not sure how to do it. Got key, but still couldn't find the door..
I encountered one strange bug, that looks like happened only to me, seeing other comments not mentioning it. In the red room I was unable to move forward. Killed enemies from the enterance, thinking it is how it should be. But only after restart saw that it is not! I was in that sneaky ghost one before and though that its a ghost infront of me, but nothing of sorts. Just like a wall that I was able to shoot through. I also had first enemy next to lion wall invisible for some reason once too...
Will try to get through blue... but feels like i am getting lost too much in there and getting stomped everytime...