I'm gonna start with this right here:
This was a godly little platformer game by Capcom that has more in common with things like Mega Man than you'd originally think. Mickey eventually gets a solid arsenal of different costumes and powerups in order to work his way through some pretty imaginative levels and boss fights. This was really an underplayed gem of a game and I highly recommend it for any oldschool platforming fan.
What are some other classic games that you don't hear people talk about very often?