How to scope your game?

This time around we did something completely new for our game Peter OS. We decided to make a game completely in UI, while none of us really have any serious UI experience. This eventually extended to having to write an entire mobile phone OS.

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So we ended up thinking of something that had a little too big of a scope. Which meant we had to cut down a little bit on the eventual story we wanted to write. Oh well, Learned a lot from it.

How do you scope your game? How do you keep it simple enough for a game jam, yet at the same time interesting. I would love to hear from you all.