Cogs
I really like the puzzles in this game. They start out as simply chaining gears together, and within a few levels, I'd already put together gear assemblies on one face of a cube, and steam pipeworks on another side, in order to power a wheeled contraption. The design is ultra-cool.
But it's a slide puzzle. God damn it. Fuck slide puzzles.
Progress: Gave Up -- Played the Steam demo