So I've been thinking random stuffs about game and creating concepts for games, but I've always had a question in my mind; "What is the Structure or Main Factors that creates a game?", Maybe this is basic, but I'm just not really sure, I've looked up on google and I've found nothing.

I made this thread for Open Discussions on "The Main Factors of a Game", you can provide examples like;

[Name of Game]
|List of Main Factors
-List of Small factors where it belongs

The other way around or just list up anything

I.E.

|Inventory goes to UI

|Equipments / Items (Power Ups) goes to "..."

|Cutscenes goes to "Lore ?", etc

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So far, these are my view on the Main Factors:
-Lore & Story
-Aesthetics
-UI / Menu
-Controls
-Graphics
-Gameplay
-Music
-System
-Social / Community

Online / Offline are significantly different, and are related to "Social / Community"

Overall, depending on the Main Gameplay, a game could be defined by a "Genre"

Please suggest me If you have something that I didn't put up.

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Most of the time, It's the "Where do I put this" question that comes to my mind, like what section do I put Side-quests, Monster-looting, NPC algorithms or Pets/Mounts to ?

by doing this I hope to know the "Solid Structures" of a game and define each of them :p
I'm mostly on the MMORPG topic, but feel free to include any type !
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Hopefully this will help myself, gamers, and other peoples with similar aims xD
Thank you in advance.

*You're free to use Pictures, Diagrams, Videos or any kinds of medias*
*Provide Links as well If you have :p*
-Sorry If It's difficult to read, lol >.>-