This looks cool! Really thematic, and seems like it'd be fun to play.
I think Goblinimax and Goblinmost could stand to be a bit stronger to be honest, and maybe a ribbon or two throughout progression. Personally I think getting to count as a size larger like Goliath would be pretty cool.
Honestly other than that I'd just say it could do with some sort of shaman subclass (counterpart to Eldritch Knight/Arcane Trickster) and maybe a "heavy-hitter" subclass (maybe with extra attack?) to round things out.