Been reading into the oversaturation of the AGS-101 display (and by extension, the DS Lite display) and it reminds me a lot of the overrated OLED Vita display which oversaturated colours compared with what the monitors the artists would have been working with. Intentionally muted colours often turned overly vivid (or neon as was the case with green) and I remember it being a annoyance with that display. It appears to be the same deal here:
I played some Wario Land 4 on my Game Boy Micro, N3DS XL (I thought maybe the screen dimming would compensate) and DS Lite and only the Game Boy Micro didn’t turn the sunset a bright yellow - it was orange there. The DS Lite had a colour gamut of about 73% of sRGB according to the experts at DisplayMate, which was super high for 2006, and would explain the oversaturation given what Nintendo R&D would target back in 2000/2001 for WL4.
I also saw this comparison over at the shmups forum, haven’t played CastleVania HoD before so it’s a surprise to me how different it looks:
