I think a lot of what you're seeing is the rather basic color palette, snes and a lot of older games were very creative with their use of colors and much more s

I think a lot of what you're seeing is the rather basic color palette, snes and a lot of older games were very creative with their use of colors and much more subtle about doing things like adding basica textural detail to items, as well as just a general use of the "outline" which very few older pixel art games used (see anything by the bitmap brothers, or secret of mana for example) which can easily be fixed by removing these options. these kinds of apps, while they get non-artists about 80% of the way... as the saying goes, the last 20% is 90% of the work :)