Frankly, there's nothing else to say. Apart from all of the things Matt says in this video. No spoilers for the first few minutes, but after that the safety is off. For those who DO skip through videos willy-nilly, a red triangle in the bottom left corner means you've veered into SpoilerTown, sweetheart.
And on that topic, be warned that we've also released the safety catch below: Anything Undertale is fair game to talk about in the discussion below, so don't read unless you're comfortable with spoilers.
Obviously though, please keep your trousers on. Undertale eh? What a game!