Okay, so most games (that is, those that are not complete on first release) either become completed over time or are abandoned at some point, for a variety of reasons. Some never make it past the demo stage, some only exist as proof of concept for a later game that contains most of the same elements, and many stop getting work done for personal reasons on the part of the creators, among many other reasons of varying validity. Very rarely is a game resurrected or the project taken over by a fan. From the looks of things, almost all of us have at least one abandoned game we enjoyed up until it stopped updating.
My question to you all, which I hope is distinct from other threads here, is not "Which one do you wish got more time?" but "Which one is still worth our time?"
Other threads have already brought up what games made you sad when they got abandoned. This thread is not here to make them redundant. This thread is to tell each other "Hey, I know you'll never see the end of this one, but there are great scenes/jokes/story beats/characters that mark it as a hidden gem." Be as specific as you like about what made the game fun for you and that others might like, too.
In other words, what abandoned games still have enough content and story that, even incomplete, are still entertaining enough to justify the space they take up on your hard drive?
For me, I could replay some of the versions of Breeding Season for a very long time (until I can get the hang of Cloud Meadow, or get a graphics card that can handle Breeders of the Nephelym). The gameplay was addicting, the mechanics had just enough depth, and I liked making all of my monsters breed with every other monster on my farm to make the best and strongest specimens.
Okay, your turns!