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Any older (PS2 or before) shmups with RPG mechanics?
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
Depending on how far back you want to go: Solar Winds 2: Galaxy was a favorite of mine as a kid. It's as open world as you could get in 1993, but I remember loving it even though I didn't understand everything (I was 6 years old). Ship leveling, unique NPCs, and shooter elements as well.