Good points. I have a little book with all the game ideas that are too difficult for now or that I don't have time for at the moment. Just writing it down gets your head clear for new ideas. Sometimes something comes up again that belongs to an idea already written down, then I can easily add it and move on.
Eventually there comes a point when I'm ready again for a new project, then I just look into the book and can see which idea seems most interesting and feasible. Sometimes none is. Then it's time to learn some new skills
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"Enjoy your ride.. cause life is hell - and then you die!"