Hopefully you designed the tools robust enough to use in other projects. That is probably why I am spastic about coding. I get bogged or bored doing something else so I switch to art or some other system. It took me years to have stamina for large projects (this being my largest now).
My notebook ideas will never see the light of day, but they are nice to go through sometimes. If I get a creative block or maybe want to pick up a month side project. Which are good just to clear my brain. Heck my last side project was a card game because I really needed to get away from coding. Again though it is the journey not the destination kind of thing. Even if I knew all the coding I do now 5 or 10 years ago, I don't think I'd have the mental fortitude to do this game now.
It is important to stay healthy. I've seen so many great games just die because the dev gets burnt out our discouraged. I get if it is your business and you need to make money. I believe it is important to fail often and quickly otherwise you'll be stuck doing a game you don't like and it will show in your final product.
Funny thing is I already have the sequel to this game mapped out and I am super stoked about starting that one! I keep telling myself not to rush this one, to get it right, do the game justice. Which I think is good. I've built a universe and story I am just excited to tell stories in.