Since it gives a 404 to anyone but yourself, that means it's not set public. Double-check your settings at the bottom of the Edit Game page.
I don't know why but I think it's all because of my payout method. As before I attached a file and had confirmed a payout method, it was getting views. But suddenly after attaching a file and confirming a payout method, it stopped getting views, which means no one can access it as I already told about the error. I am really new to uploading paid projects, so I don't know if my theory is right.