This bugs me a Little bit.
The first Goblin Village has a boss
The first big attack is led by two bosses
But after that, there is no Big Boss with a fancy outfit and weapon …
I really would like to see a Big Boss type with each goblin village.
Who is stronger and has a fancier outfit than the last boss,
After beating him or her 
it would add a feeling of a real victory.
“You have beaten the Boss of Stage 4” Woooohoooo 