Not gonna reveal too much yet. Me and @lyr1234 still need to discuss it but here's my idea. I got Undertale last Sunday and have been playing it for a while, hence why I slowed down on scratch recently (I'm stuck on a boss fight) but anyway, as you know Undertale changes depending on what you do in the game. I've been experimenting on how to switch game modes. This one is the coolest! Like Undertale, it will be split into chapters, each having different outcomes for each Route. The routes are Grape, Banana and a mystery route... The main menu theme will change depending on which route you have! The Grape route adds a new choir part and changes a few instruments. It is the positive route after all!
Pokémon