Fun game! Reminds me of Fire Boy and Water Girl. I played this by myself and found that for the most part, the best way to progress was to simply group the characters together. It'd be cool if more levels made use of things that required separation, like jumping on top of each other or working like a bungee! I love the D.I.Y feel to the sound effects, like how some of them are made with mouth, or the best one of all: "KEY ACQUIRED."