This is the first Twine novel (yes novel) That I have read and it sets a very high standard. The world building has been done really well with a fully thought out consistant background and an impressive codex linked to key words in the text.
Whilst mostly linear it has enough flexibility to adjust the story and add flavor. I highly recommend this game and the only reason it is not five stars is a handful (I found two) dead ends, for a beta that's pretty good.