What Galahad said, plus I'd say even without enhancing the graphics, 100% of the system-friendly games would crash badly if just promoted to some Truecolor mode
It's much more important to make an enjoyable game than to make it either OS-friendly OR hardcore superfast optimal hardware code. The former can be a selling point in a puzzle game ('for a quick romp', like Tetris) and the latter can be a selling point in a normal arcade action game, but that first point is always the hard one, and it's basically the same for all platforms.
breech: well, it doesn't have much graphics at all, barely any sound/music, and very simple levels. There isn't much there to take up any space, basically