There's a lot of blues in his music for sure! I've never liked Wes Montgomery much despite his reputation, and Reinhardt was mostly from an early jazz era that I generally don't care for. Green's music just comes flying off the strings though. He's a complete one-off, and guys like Lou Donaldson and Elvin Jones knew it and revered him.
It's been such a joy going through his backlog. Idle Moments is the album that is usually given a nod on jazz lists and such, but I wouldn't rank it in my top ten personally; not because it's bad but because he made such an extraordinary amount of good music in just a few short years. He made over 40 records as a main act and at least 25 of them are top-notch. His productivity led to Blue Note shelving like a dozen of his albums. Some of them weren't released until decades after his death. They're still finding new stuff to put out. Just this year two live recordings from concerts he played in the 70s were released.
If you want suggestions I think Alive, Solid, Green Street, Matador and the awesomely named His Majesty King Funk are good follow-ups if you like the tone of Feelin' The Spirit, and after that you can just pick up the thread wherever (although the studio stuff post 1970 generally gets weaker). He also had two previously unreleased tracks on a Blue Note collection called The Lost Grooves that are both immediately accessible and impressively lasting:
