Many sites got VPN IP list and just ban them. It’s more and more difficult with restrictions increasing subsequently.

At that time Flashback was very realistic

Games industry tend to have realistic graphics since the begining. End of the story.

Take a look at Tuta

You should be able to do that with a game engine like construct https://www.construct.net/en , phaser or godot. That’s pretty easy even for beginners

Any flatfile cms should do the job.

You could try https://automad.org/ and setup up a password page to keep it private. It’s super simple to maintain and secure. You just need a vps and a domain.