Mine sounds like it's very much along the lines of @10d22's. Currently you control two players at once who have opposite gravitational directions, but they can become disjointed along the global x-axis as well as cross each other's local y-axis. I'm thinking I'll try to incorporate puzzle elements into the game, but it might also be interesting to have some metroidvania-esque business as well. I can imagine a certain level of difficulty would emerge from having to make rapid decisions for two characters that are not locked to the same x position. Anyway, we'll see! Let the fun begin :D
