My brain isn’t working today so I’ll just second Katsuo on the Donkey Kong Country trilogy on SNES, that’s three solid games and all worth going for the 100+ %(yup, plus) completion.
Random one that just popped up; Blaster Master (NES) - One of the best soundtracks ever. “Metroidvania” IN A TANK. I never played it as a kid but one of the better NES games I enjoyed as an adult.