I always listen for chord progressions first when determining if it's Hamauzu or not
But yes, he loves the violin and typically works with Kuwano a lot because they're bros.
His style is probably my favorite in all music, and his non-gaming endeavors are all really worth checking out if you are a fan of more traditional music in the vein of his compositional voice. IMERAUT is really great too, albeit a more non-traditional approach to a fusion of styles mixed with some Ainu influences thanks to Mina. I studied and presented a lot of his non-gaming music while in grad. school, and it always went over really well at conservatory.
Even performed some piano pieces for juries, heh.