They don't play the 8-bit sounds using their instruments, they are tracked using a real NES and played live using playback. The guitars usually play the same things as the NES though. They layer it all on top of each other.
Endless Fantasy is the typa album to get your mind right. Even when there's no lyrics it reeks of positivity and reassurance. It's like this album wants me to be a better person, it wants me to stop dwelling on the past and look to the future, and to treat people well. It's a truly abstract feeling. Like I know plenty of chiptune has a super posi vibe to it, but Endless Fantasy really gives me a feeling that I can only compare to Andrew Jackson Jihad, if you can feel me on that.