Update: As of version v0.1.5, the Linux version now has sound!
https://github.com/open-goal/jak-project/releases/tag/v0.1.5
I think it's only a matter of time before this port becomes the best way of playing this game. A nice win for game preservation.
...and I've 100%'ed the game. Safe to say that the project is fairly playable! Only issues I noticed were some weirdly displaying particles in the volcanic crater. Can't wait until Jak 2 is ported.