I know this is two years old, but I'd really like an AppleTV version as well. Probably about 80% of my music listening is through AppleTV because that's what's hooked up to the good speakers. Even if it were just a player app and you set everything else up on either the iOS or Mac version.

This would be (wait for it) !

Generally, yes. It's not a straightforward port as the Longplay relies on the iTunes-like library that's available on iOS (or macOS), but AppleTV doesn't have that. So I'd have to build this a different way. Not a showstopper but also not sure yet how much demand there is for it.