Coming up with ideas and going to others is common for various things, I've fallen victim to it more than once myself. I had this problem with writing mostly. What I find works, develop all of the ideas, pick your favourite and work on it and then you can start applying all of your other ideas into it.
EG. In the story I am writing I had great ideas of the characters meeting after a bar fight, then I had the idea to have some child hood significance - I combined those two ideas, so that the two characters meet as children, but the bar fight drifts them apart (As one didn't like the other getting into a petty bar fight)
So essentially all or most of your ideas go into one game, they don't even have to be the same style game with each idea, but you can take principles for each, like I could restart Ronin, but tie in the mysteries and 'dreaminess' of Shadow Behind the Leaves and some of the neurotic delusions of Abeyance - the main character Akai could lose people he loves and follows the mystery of the death of that person, the grief starts playing with his mind.
So combinations work. So if you're eager to work on one idea that you aren't working on, make sure you got the main engine parts made and then you can jump back and forth from these ideas (I don't recommend it though, but you work better when you feel inspired
)
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