Ask HN: What game do you wish existed?

It's not a specific game per se, but sometimes I wonder how it would turn out if a decent game dev were to take one of those clickbait-y mobile game ads (you know, the ones where it is obviously a dolled-up mockup of a game that doesn't really exist) and actually attempted to make the game it is depicting.

This gave me the cool idea of a kind of recursive/fractal game where there is the main game you can play by itself but the devs keep it open for people to slot in sub games for the bits they've simplified.

So if Factorio did this you could play as normal, or play the fractal version where you can go in and control the mine or anything else. Maybe there'd even be sub parts in the mine like repairing machinery or something. The full range of macro-micromanaging would be pretty interesting.

A 2-d circa original NES jrpg video game version of ICE Middle Earth Role Playing TTRP game using all the ICE source material. Not the garbage LOTR console video games that horribly emulate the movies, but an immersive world setting of Middle Earth with non-trilogy storylines and open-world play. It can't be done due to copyrights and trademarks, but it would be awesome and I've thought for decades of creating it for personal play, but I think that would take a single non-game dev forever to build. Just going to have to dust off original NES Dragon Warrior and Final Fantasy on the NES...

I really have a thing for transport simulation games. When I was young I played a lot of Transport Tycoon, but it was a bit too heavy on trains. You could just use trains everywhere and be done with it. Also it's nearly 30 years old, I want perty graphics on my 4K monitor.

I played a lot of Cities in Motion 2, and really loved it. You can't just use trains (as they are expensive), you need to build a complete transportation network with feeder routes and use different modes of transport. The only issues were it is a little buggy, the UI was a little complex, and performance really tanked once your city got to a certain size (because Unity).

Cities Skylines was meant to be CiM 3 mixed with SimCity, but they really nerfed the transport mechanics there IMO. As a overall city simulator it's great, but as a transport simulator not so much.

Transport Fever just feels like a TTD clone with prettier graphics and worse game mechanics.

I game in which I would generate, color and transform a natural looking landscape by either thinking about it (preferably), or by moving my body or hands, singing, etc - whatever. With undo please.