It was the first game of the Rubble Saver series, which continued on Game Boy.
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TIPS AND TRICKS
When Ropitt is hit, it breaks down and the girl falls out. As the girl, you can still run around and even reach the exit, but you cannot shoot. The girl can only survive for a short amount of time outside of the robot, and will die after around 30 seconds, which can also be judged by her theme music ending. It is possible to get back into the robot if you collect a Power Item and manage to get back to the robot.
The game must be played through twice in order to see the true ending.