This is actually wild. I have no idea how this works. Does it somehow emulate the rendering engine of each of these games to render the map? The water in Half-Life 2: Lost Coast is just how I remember it. Very cool.
I wouldn't say it emulates so much as implements a renderer for each game. It's totally nuts.
Always remember, folks: the best feature request is a pull request ;)
I can wholeheartedly recommend going through his account there and on bsky, lot's of interesting stuff.