SNES ROMs were actually around 4MB. People always spoke about them being 32 Meg or whatever, but they meant megabits.
I did like Animal Well, but gave up after looking at one of the bunny solutions and deciding I didn't have the patience for that.
I think most of the size of games is just graphics and audio. I think the code for most games is pretty small, but for some godforsaken reason it's really important that they include incredibly detailed doorknobs and 50 hours of high quality speech for a dozen languages in raw format.