I played a bit of the Rusted Moss demo back in March and was immediately smitten with its grappling hook-powered exploration. Granted, you could add a grappling hook to just about anything and I'd probably try it, but this really did seem like something special. It's a side-scrolling Metroidvania set in a dreary but lovingly detailed world caught between warring humans and fae, and that world's only getting more engrossing the more I play now that the game's properly out. The lovely pixel art and music set the atmosphere, and the ominous narrative looming over protagonist Fern maintains an air of mystery, but it's the breakneck platforming that's truly keeping me on the hook.
