Simple idea, but excelent execution- great design, top originality, and theme match, plus gorgeous aesthetics. Top rating in all areas for me.
My only suggestion in playability would be to punish the player if the right sock is show but space it is not pressed (maybe it is already done in other way) and maybe reduce the difficulty curve a little for an extended gameplay, but those are nitpicks for a game that cannot be 100% polished in so little time.