アルマジロ © 1991 IGS, Incorporated.
Game ID: IGS-9T
Armadillo was released on August 09, 1991 in Japan.
Inside the game's code, sprites for a rabbit boss can be found, but these are never used in-game. It was very likely this was going to be the boss of San Francisco, the game's fourth world, until being swapped out with Mecha-Fatadillo.