Super Metroid editor

hey every one,
i was wondering if any one knows of a program which you can use the super metroid engine to make a game or a program which you can heavly mod the actual super metroid game so i can make an all new game.

i dont really care about copyright and all that stuff, i just want it for myself and if i do release it, ill change the models and stuff

There is a program in the works called Classic Super Metroid. There is a demo out, but I don’t get it.