Don’t stick too much to the Pokémon GO concept. It was a cool, trendy quest, but before investing time and money in any idea (even a good one), check important numbers. What’s trendy? What could be trendy? It’s difficult, I know.
Look at R1. It seems like it’s from the 80s, and look at all those nerdy people playing Among Us, watching Stranger Things, reading (and probably watching) Stephen King, and collecting retro-style hardware. Think about these people and their “journeys.” Who knows, maybe R1 could be a window to a parallel shadow world where you should move like in an escape room or the Mid-World from The Dark Tower.
I think before starting any game development, there should be a robust bridge from game engines like UNITY or others. This way, anyone could try and discover possibilities.
Please upvote my thread about plugins for Unity.