devtrackers.gg
I think I pointed this out to Klonan before, but the Starbound devs get around this by adding another game as their unstable branch, so both show up in your library, looks like this. Apparently they can track it that way.
You guys might consider splitting stable and experimental into two games, that both get added when somebody buys the game. I have 0 experience with steam's internals so I have no clue on how you'd go about that, but it'd be worth looking into.