Very fun, like all the Baskerville, several Lovecraft stories and other stuff thrown in but still staying pretty original. The story was kind of compressed for the sake of the episode I thought (though I don't know how long the whole thing will be so I might be wrong) but if I'm wrong and you have a whole lot of it left to tell then bravo to you. Voices and writing is...I won't say perfect but it is excellent IMO.
Oh and one more thing
Things like not being able to click (not going into the menu) on a door to go into the next room kinda bothered me but not a lot. Oh and a funny "bug" happens during cutscenes - McCarthy starts smoking when
I was expecting him to start smoking at the end as well, cause he looks so badass for smoking at such akward situation.
Also I didn't hear the scream and some other effects which was kinda of strange. McCarthy for some reason also thinks everything is a Van Gogh copy, which first seemed lazy but then became funny...maybe it's some reference I didn't get.
p.s. music is great, atmospheric, interesting...at the end seems to be heavily like the SH theme but still that's not a bad thing.