What are some of the best retro co-op games?

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If you both like puzzles, check out Castles of Dr. Creep. Two player co-op puzzle action in a castle full of traps and monsters and strange devices.

countless beat-em-ups, but otherwise I had quite a bit playing Jackal (NES) co-op

and then there's also the legendary Seiken Densetsu

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Zombies Ate My Neighbours.
Snes version, unless you like your ears not raped, but aggressively molested.

>>4154716
Pig Out (arcade)

Pocky & Rocky 1/2
and
Knights of the Round

are probably the ones i played most with my friend growing up

Runsaber

Goof Troop
Dungeons & Dragons: Shadow Over Mystara
Cadillacs & Dinosaurs
Smash TV