Thanks for the advice, I will keep that in mind, and I never thought of mixing in the things I like and dislike. This is very helpful.

Base it on either a gameplay idea that you think would be fun (Like knights running around in a 2D arena trying to kill each other)

or base it on a fiction you like and try to make the mechanics spring up from the setting

Here's the game:
It's a baby version of sims.
You walk or crawl around, play with toys and level up your abilities. You can also choose to go to school, or have a nanny, and when to take naps. You interact with other babies via symbols of interests. Everything in the home levels up, from the carpet to move faster, to the bottle which improves hunger satisfaction.

You balance your time having fun (playing) with mechanical activities. Based on your interaction with the game, you will get a unique "first word", which will be repeated by the parental units or caregivers in daily conversation. The game lasts up to age 6, wherein based on score, activities, picture books, and interest levels, among random daily chaos, you will be assigned a small autobiography of your life including career, status, and mortality.

Um, Prof, this sounds like a very good idea. 

What, you're surprised? I have these ideas all the time. The problem is, these ideas don't stop. I also have songs that I've never heard play in my head.

It's this really cruel life where I have all these visions and no way to actually do them because I have no skills :D It's also hard to have conversations with people because my brain just goes "hey check this idea out" mid sentence. 

Here are some others I posted in a gaf thread:
"So, my idea is a Noir style detective series starring a private eye that used to be a doctor but lost his license after drinking too heavily. The main character is a chimpanzee dressed in a trenchcoat. However, the world is normally populated with humans, he is just a chimp who somehow integrated with regular society.
Also, his name is Mr. Chim, but gets upset if anyone calls him Chimp."

This next one is my favorite:
It's a medieval SRPG set in feudal england, but here's the catch, there are 4 heirs to the newly dead king's throne. The problem? They are quadruplets, so none of them are the rightful heirs....to make matters worse, nobody in the kingdom is even aware that they are quadruplets! So each person's action contributes to only one person. Your task is to set each quad out to do something. You can set one to learning from books, one to magic, ar any combination you can think of. However, if one of them dies, you lose them for the rest of the game, BUT your fame and exp is increased by 100% for each one to die. Additionally, there is a dating sim portion. Will you kill one brother/sister and take their lover? Will you send off a sibling to die in an unwinnable war? Or will you join forces and have them all date the same person? The choice is yours.

Here's another:
You play as a ghost inhabiting a house in a very dangerous city area, like LA. The person who lives there is your great grandchild. It is a Sims style top down puzzle game in which you must accomplish tasks without being noticed otherwise you increase the person's spook meter. 
Tasks include helping make dinner, but how will you chop the carrots without being noticed? Perhaps spill wine on the person, making them go off to do laundry.
You are also tasked with spooking off potential intruders/murderers on the street and in the apartment.
Think of it like Casper the friendly ghost meets hitman. You must set up a clever strategy to aid the living, but must avoid being seen.

I agree this does sound like an amazing idea.

I find this very interesting. This being so, it would also open up opportunities for creating sequels. Such as making a game in the future where you can play as a different age level. It could almost be like with the Dragon Age games or with other games where you can carry your character througout all of the games, and keep advancing upon their play style, and be faced with those different situations. You could also be faced with different situations based on the age level, and it would all end up being okay.

I really miss games like point blank and there is nothing on the market for this. Whether it's VR or not, I think there is potential for a light gun game like point blank.

I would play the shit of number 2. The SRPG one. 

Yeah I was thinking that too, but didn't want to get convoluted. Plus, it's a very "industry" idea to sell 6 years of a game and the rest in expansions :D:D:D:D

I'm taking computer programming next year, so maybe I'll be able to actually do this one day.

Yeah, I think it really is my best idea for a game ever.

There is just so much you could do, and so many variables. It has the naming fun conventions of Oregon Trail, where it's fun to see who dies first. Fun to see who gets the girl, etc, etc. And then there's all this fun stuff about how people thought they saw you die, but there you are lifting boulders off of roads, and slaying a wild bear. Of course, everything you do in the game gets "hyped", so if you save 28 villagers from a gang of 3 marauders, the rumor spreads that you held off a horde of barbarians and saved a town. etc. But then sometimes, you randomly get villagers who are "jaded" and they're just like, 'eh, he waved his sword at some kids'. 

It would just be really fun to play.