Youtuber who got Starfox Zero says it contains 20 levels + arcade mode + hidden mode

[Edwardooo]

Pavolink said:
Are SF games always so low in content?

Starwing (SNES) and Starfox 64 can be finished in one hour and a half. But the point of the game isn't to just finish it once and done, but more to score it.

Still, Zero seems to have more content than these two.