Speaking as a game dev, I think you can learn it, but it takes time. I was interested since a kid to make games. And as a teenager programmed some for the web, and trying to learn C++ reading Quake2 source or whatever I could find, also bought some game dev books. Not much came out of it I thought. At around twenty, there were enough tutorials in Macromedia tools to sort of guide me toward something.
Then I struck luck getting into game programming at a tech institute. Finally I could make something, it took more than a decade to get simple games on the screen for me. But I get easily distracted, procrastinate and lack enough IQ. Those books and formulas were hard for a mediocre teenager.
Parallel to all this I was interested in music too. Fooling around in ReBirth and Fruity Loops. Many years later got a guitar and tried to learn that, you get a lot of music theory from that. That theory is much easier than programming, still takes a lot of time.
Drawing I'm not really good at, but got an eye for what looks decent and can play with colors. On a computer it can almost be like cheating because you can be "inspired" by others. But books and tutorials on art exists too of course, how far that rabbit hole do you want to go? And 3D is a bit of a mix between tech and art, you could draw a cute character on paper front and side with a pencil. And when you model, texture, rig and animate that; it can be really impressive.
What I am trying to say, it looks like genius but it is a lot of work over a period. But it is creative/craft work, and not boring. And you can learn the basics of all the areas and make something great. When making apps, all those areas of you are unused. No music, no art. At best some graphic design (UI).
If you want to really put it in a compressed environment where it is not (?) overwhelming, but still technical, try C64 programming. There are lots of resources and step-by-step guides, and you will get a taste of everything and can build from there.
We are many that have the desire to make our own games. Some are indeed geniuses, or very strong in multiple areas. Others just stumbled across Unity and are going through whatever guides there are with desire. These days you can choose your difficulty and dedication level.
For simpler games, getting your game to run on desktop, iOS and Android is not that hard. Because most platform code will be some glue, and then you are off inside your own game code. It takes weeks/months to figure that out, but then you are done and carry it with you for every game in the future. Then when you put it all together plus the uniqueness of your game (because it is unique right?!), you get a great and interesting blog post like this one!