Forgot about the new Neanderthal (Solo guitarist Mick Murphy, not the Grindcore/Power Violence band) album:
https://neanderthal.bandcamp.com/album/cave-math
That Ripped to Shreds album might still beat this one, but this is definitely a contender as aoty for me. Instrumental metal at it's finest, Hellzone Overload especially is a beast. It's unfortunate that Mick Murphy goes so unnoticed, he's doing a lot better than the classic shredders these days.