I know it says NES in the description but this looks more like GBC because of the colors. Since the GBC had a bigger color palette than the NES.
the 3-colors-per-sprite style is what gives it that signature NES look
Gotcha, in my mind I was thinking more about the maximum number of different color shades (NES had 56-colors while the SNES used a 15-bit RGB which had 256-colors).