Here is a full hack for Super Metroid. Has some ASM changes with Samus's movement & enemy behavior. Also some graphics changes have been made plus the level layout as well. Not much is documented on this hack due to it being of Japanese origin. Comes with patches for Headered & UnHeadered ROMS.
Super Metroid (Japan, USA) (En,Ja).sfc - NOINTRO
CRC32: D63ED5F8
MD5: 21F3E98DF4780EE1C667B84E57D88675
SHA-1: DA957F0D63D14CB441D215462904C4FA8519C613
SHA-256: 12B77C4BC9C1832CEE8881244659065EE1D84C70C3D29E6EAF92E6798CC2CA72