Combine more projects into the same codebase. With games this is easy - make a "multicart" game that has more than one game in the same program. Once that is d

Combine more projects into the same codebase. With games this is easy - make a "multicart" game that has more than one game in the same program. Once that is done, you always have the whole portfolio of unfinished-yet-related things sitting there. If you can't work on any of them, you start a new one, but eventually you hit the point where you can see that you're just redoing an old one. You don't get stuck on overengineering it because the context of it is already as a small part of a whole. If one of them proves to be a really good idea and more deserving of attention, you chop it out of the original context.