In that case, SNES emulator is possible, but it would be slow. Run Snes9x at 100 if possible on your GP32 and the result will probably be the same as on the ngage.
Now I notice that at 133, the SNES emu is slow, so at 90Mhz (100Mhz - phone usage), it would be almost crippling. It would run a few games, just not very many of them at acceptable speed.