Well take it out of the trash! It's a little rough but I like it.
I really liked the twist of our protagonist being the murderer, that was nice.
My only complaint really is that everything happened far too quickly. I'd suggest adding more time between murders, maybe take some time to describe the house and the rooms and more character development for all of the characters. It felt like every new character died in the same scene they were introduced. You may also want to allow a few characters to escape, maybe solve the mystery, but that could be a different story.
I also liked that little counter of how many people are left at beginning of each segment, that added to the tension nicely.