They do great work over there at Knights of Bytes, really pushing the hardware of the NES and the C64, at least I think they are - for all I know it could be just untapped power hidden in there somewhere. I just know it is impressive and looks amazing and seems to play just as well as it looks.
There are tons of games pushing hardware over on Itch.io by indie developers. I have a backlog of hundreds of games that I want to feature. Slowly but surely getting there.
RE: Wolfenstein 3D Inspired First Person Shooter Engine Shown for Commodore 64