Metal Mutant

Metal Mutant is a side-scrolling action-adventure game developed and published for MS-DOS, Amiga, and Atari ST by Silmarils and released in 1991. The game allows the player to transform at any time into three different robot forms: Cyborg, Dino, and Tank.

The player controls Metal Mutant, the ultimate battle machine, which was sent to the heavily protected high-tech planet Kronox to find and destroy the tyrant AROD 7. On the way to this goal, the player needs to solve puzzles and combat hostile lifeforms and enemy robots.

Source: TheGamesDB