What next?

pypi on 2019/03/26 03:30 of Route 6

And here is where it becomes clear that I hadn't thought this through very well...

I've made a basic (read: semi-functional, not terribly realistic) 2D side scroller bus driving simulation, complete with "passengers". The real question is: what next? How do I turn this into an actual game? Should I focus on making the simulation core more playable? What about levels or incorporating real life routes?