This is a little sad. But it can be hard to let go of something that holds lesser passion for you than when you first started. Its a very common issue with game dev. Have been mucking around professionally and non-professionally in the game business for some 30+ yrs… I really feel for you. You would not believe how many commercial games go through this same problem due to so many reasons: publishers mood changes, market demand changes, tech changes, developers literally wear out… and many more. So dont feel too alone in this space… and… I would like to say… it comes back. What does?.. the passion for the same idea. Give it time to swirl around in your head, write notes, write ideas… tinker with simple little “test ideas” that would fit well in the game. Over time… you might find yourself writing enough ‘parts’ to make the whole quite achievable…
Also… look to the community… Defold is utterly brilliant for this… reminds me alot of the early Unity3D days (circa 2006 ish) where the community and the people were really passionate and really invested themselves into helping others and sharing. Its a big thing to have…
Good luck with the future… I hope you get back to your game sometime… I might have a peek 
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