Deathbots

Deathbots is a third-person perspective action game developed for the NES by Odyssey Software, and published as an unlicensed title by American Video Entertainment in 1990.

Gameplay
The perspective is from an overhead point of view.

The player controlled character is a robot seeking to defeat the evil Deathbots to reach the "gamma bomb". Weapons to fight the Deathbots are found throughout the levels.

The game features eight levels. Each level is essentially a maze consisting of complicated passageways interspersed with teleporters. Each level ends with a boss.

Plot
The Mutech Corporation has created their Gamma Base on what used to be Alcatraz Island. Their attempts at creating computer intelligence has backfired, as the AI they've created has taken over the computer systems and is threatening the world. Deep in the fortress is a gamma bomb, which one lone robot must destroy.