At what point do you create a Kickstarter/Submit your game to Steam Greenlight?

[MrGoatsy]

@Archerx;570879

When you’re trying to figure out if your game idea will work. You don’t do all the art only to find out that the mechanics won’t work. Think of it as the proof of concept.

I am already past that, how much should you show in a Kickstarter/Greenlight video and what points make it so that people will like it? What do you tell people?