Simplicity, part of the appeal of the NSMB game is that and makes it appealing to big audience. The art style is ismple as hell too, i dont know how much bettr textures you want on a cartoony looking grass or how much polygons you need on a goomba. They will look pretty much the same. The resolution is bad because the 3ds res itself is bad. This is 2d mario, the game itself revlover around level design and content. Graphically there isnt a lot to do or really improve with the NSMB franchise, just change the setting, but will lose familiarity with the casual market.
I agree music should improve tough.







