That's really cool, really pushing the NES to the max. The faster scroll speeds would be the main barrier to a C64 version, would probably also have to use chunky multi-colour graphics for the map in order to use colour cycling to approximate the flashy psychedelic effects.
Viewing post in Pacman C64 (Original Concept Map) comments
Yes, agreed, the scroll routine would have to be highly optimised. But there isn’t anything that says impossible. What a great challenge?! Honestly, I programmed “in the day” on a proper C64 on Zoom assembler so I’m a good judge of what’s capable and you could do that, okay might be very slightly slower but very doable.