The genesis is arguably a 32 bit console as well. The genesis has only a 16 bit bus to memory, but the GBA has only a 16 bit bus to it's cart and most RAM as w

The genesis is arguably a 32 bit console as well. The genesis has only a 16 bit bus to memory, but the GBA has only a 16 bit bus to it's cart and most RAM as well, leaving only on die RAM and MMIO with 32 bit bus accesses. Additionally, it's GPU is very much derived from the NES->SNES family of PPUs. VRAM can be used as a LFB, but it's generally not the best use of the system. I'd argue it's about halfway between a stock SNES/Genesis and an SNES/Genesis with a cart addon chip like an SVP or Super FX.