Yes it was in the game, I was there with a friend and it took us hours to leave the island with everything collected.

Haha, that is awesome I totally didn't think of someone doing that xD
I imagine you found the island in the game then? I spent a while looking for it but wasn't able to find it before the game was shut down (as far as I am aware, Bossa never told anyone if their island made it into the game so the only way to know was to find it).

To be honest I couldn't solve the labyrinth and I just stacked baggys at the exit to climb up there, and it worked ^^