If you're really curious, try the PPSSPP emulator. You can even launch it on the phone. At least the YS series deserves a try, it was really a great recommendation. Don't start with The Oath in Felghana, as for me, but all the others are masterpieces of their time (first two had a strange battle system, but you'll adapt quickly

).
Well, you can try also Nayuta no Kiseki, there the plot also revolves around traveling to a parallel universe.
Well, nintendo ds emulators generally work on almost everything, and there is such a wide selection of RPGs that you won't be able to get through everything in a few years.