Lots of people want to make big games they're inspired by, but there's one major thing you have to consider. Time. If you're one person trying to do everything for a huge game idea you're in totally in love with then you're going to burn out before you finish. At least in my experience.
I would suggest making the game smaller content wise and shave down the features until they still resemble the game you wanted in the first place, but on a smaller scale. Give yourself a plan you can complete rather than being something frustrating that you'll work on for years and regret spending time on later.
This is just advice from me. If you still want to work on your project as you have plans for it now then you by all means should.
Don't let anyone tell you that you can't do something.
hello! well, i have several things to my benefit in this regard:
no one else is relying on me to do x,y or z, since i'm the only person working on it. this gives me lots of wiggle room
i dont have to make 3d models and therefore, no skeletal animations and associated issues.
i dont have to make lighting filters for scenes since they are literally all static 2d images that are painted rather than rendered and just manipulated with normal website functions.
i'm old, retired and my kids are grown so i have lots of free time on my hands.
i'm not working for a game company, so no time constraints.
dont have a kickstarter, so no investor issues.
not using a game engine so only restrictions are relegated to browser capabilities.
can take breaks from the project whenever i want (which frequently works out well cause website features are getting better and better and useful scripts pop up that i can use in the game)
i dont have a plan because plans require dedication that leads to burn out. i just work on it till i'm tired of it or hit a design problem that doesn't appear to have a solution and hope an answer will arrive later when i resume working on it. this has worked out really well on several occasions.
in effect, my case is kinda unusual. yeah it's a big project, but alot of the work has already been done cause i've been working on it, off and on, at various spots in the game's progress, for years. if i dont have actual product for a section of the game, i have the design concepts done. etc
my biggest time sink is my lack luster art skills, old graphics software and bad eyesight.