When Double Fine Productions is attached to a game, you can pretty much be assured that’s it’s going to be inventive, fun, and at least somewhat weird. Stacking ($15) is no different. Having first been released on consoles, and then Windows and even Linux, the studio’s Russian stacking doll game has now found a home in the Mac App Store. In it, you play as Charlie Blackmore, the world’s tiniest nesting doll; that should give…