An escape with 3 alternate endings? Great!
For lack of another way to say it, I think the most needed improvement is some "production value." The still images were great at being easily recognizable puzzle elements, but the final confrontation (which was difficult to uncover for players who solve the laser puzzle before using the mystery box) was a little disappointing in its presentation.
The puzzle/game design is impressive. I felt it was the proper balance of challenge without being obscure, random, downright unfeasible, or coerced together to the point where the player is left just going through a series of trial and error with their inventory. Adequate hints were scattered for just about everything, the secrets were fun to find without being giveaways, and the inclusion of red herrings that were not part of the solutions added something that a lot of escape games don't have.
I think my only complaint is that some of the messages in blood were hard to read, and the strange behavior that they only appear in the dark took away from their actual impact. Sometimes less is more.