The quantity and variety reminds me of the stupid amount of sprite work done by Ahruon/Abysswolf for Card Saga Wars:

https://cardgallery.tales-tra.com/cards_blue.htm

https://www.deviantart.com/abysswolf/gallery

Literally hundreds of characters. Between this guy and TFA, I feel spoiled.

The best adventure games are 2D because random walks there always return (Pólya). Not true in 3D, so puzzle games there end up either too easy or too difficult.

3D is just one technique for generating 2D.

For whatever reason I'm getting strong Commander Keen vibes here.

Lots to dig in to here — thanks for posting. Internet Archive says the site has been around since ~2010, which is a likely indicator that its current iteration is handmade :)

I like how so much of this is interactable and has so many game like properties. Makes exploring the website and all the information actually enjoyable and intriguing.

This is nice. It's a testament to the pixel art made in the past with very limited resources (colors mostly).

Fun "easter egg" if you actually punch in the konami code (Up Up Down Down Left Right Left Right B A) on a keyboard.