Porpentine is currently the best writer of Twine fiction out there. Howling dogs is perhaps her best work. This branching, non-linear long game is a far cry from most twine games, and in fact better than most parser games.
In howling dogs, you are imprisoned in some sort of futuristic cell. You alternate between boring, daily life and brief trips in a VR machine. The trips become more and more complex, and have deep underriding themes about inevitability and restraint.
I only got the bad ending at first; I didn't realize there was a good ending until I read the reviews. To get the ending:(Spoiler - click to show)On the page with tons of links, one link will give you the good ending. It isn't random, but plot related.
I recommend this game for everyone.