Apartment 69, AOA Academy. Summertime Saga isn't technically abandoned but a tiny tech update every year or so doesn't really count as a living project.
the standalone game was pretty good in beta, then it kinda went downwards and they eventually stopped releasing new content for it, just kept the servers running for enthusiasts
Music in games definitely improves the experience and adds to the atmosphere, but if i had a nickel for every time a dev puts music in the game menu and it's WAY too loud, i would have a lot of nickels.
Part 2 doesn't really remind of first game too much. I'd say we'll have to wait a while to see certain tags to come back. The dev was fairly generous with content in pt.1, so wouldn't surprise me if he decides to milk the game a little