I am trying to create the concept of game mechanic, I will be very happy if someone can help with advice, an idea or just a feedback. 

In short, I want to make a coop roguelike for two people. I plan it to be a half-slasher, a half-quest with a random plot generated, based on the actions of the…

I'd say that:

It starts with the first good idea you have. An event, an universe, a character, a place. Anything. Then you fill in logically: a character will need to have an occupation, a personnality, to live somewhere, and then you can dire…