Much of that is for art assets. Do it with fewer or lower-resolution textures and sprites, and you could get away with quite a bit less. The executable code c

Much of that is for art assets. Do it with fewer or lower-resolution textures and sprites, and you could get away with quite a bit less. The executable code can fit in well under one megabyte. You could even procedurally-generate the art, if you've got way more CPU core available than storage. The SNES ran Doom with two 64k RAM banks (albeit with textures and data such as level geometry running directly from ROM.)