I was putting together the CTTTSYPBF soundtrack together for Bandcamp Friday, and figured I should make the sound effects available, too!
To be honest, I feel like there's a tendency to over-rely on programs like BFXR for "8-bit" sounds, even when those programs are severely limited. They can't quite replicate the sounds you hear in NES and GB games the same way that messing around in a tracker can.
So I hope making these available can help other indie devs!