The Drunken Lizard Pub

Looking to (re-)buy this one on Steam, but before I do...

I know that Steamworks has a tendency not to include the Linux icon on Steamplay games that support it, but... is Book I available under Linux/Steam?

No, its not. Its something I've been complaining about for months.

For what it's worth, this is almost certainly a Steam problem rather than a Basilisk Games problem. It's evidently very difficult for small studios to solve even basic problems with Steam.