Even then, there's the whole kebab of creating skeletons for the models you create and animating them-- a process which takes an eternity in itself! Composing music, too, takes a while; to single-handedly create a game, you'd need to be extraordinarily talented in multiple areas.
It's why many games are made by a team focusing on different departments, for example, one person for music, another for lighting, another for scenery, another for animating, texturing-... Everything! Whilst FH isn't one of the more complex games, it's still a difficult feat to replicate something like it. Heck, most of my commissions are doing different tidbits for different games- I've currently one commission to skin a model, and another to write a piece of music for a tundra zone.
Don't be deterred, though! I'd really recommend with starting with more simplistic 2D games and working your way up. It's good practice, and you'll learn something new with every time you try. You could look up some cheap courses, too; my local college offers free classes in game development and software! It'll be difficult to create a complex 3D game alone, but-... Then again, there's recently a single student who created a
small movie that rivaled the animation seen in multi-million budget films.
