GBA is a great console, imo. The library was excellent and it was late enough to have some more modern game design sensibilities in the titles. Metroidvanias imo are where this really shows up - SCIV had pretty conventional level-based gameplay without the exploration aspect of the later games and only Super Metroid (strong rec btw) really went all in. I have limited nostalgia for the 16 bit generation because most of the games have that same, fairly straightforward, beat-this-level-to-get-to-the-next-one sensibility (also I was a sega guy through and through and the Mega Drive frankly just wasn’t as good as the SNES…) Metroid Fusion has already been recommended and I agree it’s fantastic. I also love the Castlevania GBA games - Aria of Sorrow, Circle of the Moon, Harmony of Dissonance. Aria in particular is critically acclaimed, the other two got a mixed reception but personally I don’t really see why, they’re fun as hell. Final Fantasy Tactics Advance was one of my favourite games ever at the time but the hit rates and slow character movement just frustrate me now, which is a shame, because I genuinely had a blast with it back in the day.