Here is a patch which changes the colors and looks of all the space pirate enemies encountered to make them more distinguishable.
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Super Metroid (Japan, USA) (En,Ja).smc - NOINTRO
CRC32: D63ED5F8
MD5: 21F3E98DF4780EE1C667B84E57D88675
SHA-1: DA957F0D63D14CB441D215462904C4FA8519C613
SHA-256: 12B77C4BC9C1832CEE8881244659065EE1D84C70C3D29E6EAF92E6798CC2CA72