Being able to focus on just one game idea until completion?
I have plenty of notebooks full with designs for “dream games”, but very little to show for it.
But, if I had to choose, I’d love to make a metroidvania with procedural generation and an easy to use map/asset editor. Maybe even in 3d!
Heck, I’m tempted to prototype the idea by building a “Metroid Maker” ripoff (assets are already done!)