A delightful evolution on piano rock. I'd use the word 'progressive', but that might remind you of Pink Floyd. In a similar way, I learned that Daniel Lentz is a "postminimalist" composer. Kinda seems like we're running out of words lol.
I'll start it here. This kind of music is now called Zigerionious. You don't have to follow my lead, but wouldn't it be cool if 50 years from now everyone knew about Zigerion music? :P