Startrail: Still feels like a demo if you ask me. :D There was another game that was similar,
Our Lives Beginning Always that had a similar model. In the end we all agreed to disagree LOL
Discussion was found here at this post
https://www.gog.com/forum/general/list_of_free_games_on_gog/post489 Calling South Scrimshaw, Part 1 a Demo would be like calling the first episode of Game of Thrones a demo for a tv series or the first Harry Potter book a demo for a book series.
South Scrimshaw, Part 1 is comparable. It tells a complete story with the expectation that there is more to come. It is meant to be comparable to watching an episode of Planet Earth as there's things that occur like they turn on lights at night to see what the whales are up to, but the whales just react to the lights that were turned on to watch them causing the scientists to turn the lights off.
The only argument that I would make against it is that it really isn't a game.