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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)
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Sigma Star Saga for the GBA is a shoot em up RPG - might be the closest execution of what you're looking for.
I have it on my device but havent tried yet, will give it a go today!