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It was so disappointing, it would have been so easy to make it work with couch co-op and online multiplayer with just a little bit more effort. I was so excited when it was first announced, and then I don’t think I played it beyond the first day it released after trying online play with my brother.
The original was a masterpiece of couch co-op, but it’s increasingly difficult and expensive to play it on original hardware anymore. Fortunately you can get away with connecting multiple instances of m-gba and dolphin to recreate the experience on emulator for couch co-op at least.
I would recommend editing your fstab and use the USB drive’s UUID to mount it to a consistent location. That way, even if you reboot or disconnect the drive and the reconnect it to, say, a different USB port, it will always mount to the same mountpoint.
See this page from the arch wiki for more info.