[Genesis/Mega Drive][1990s] A side-scroller where you control a robot in space

I've been trying to find this game for years. I think I only rented it once, so I only have vague memories beyond the beginning. Been looking for it in and out for so long, at this point I think I'm just gaslighting myself about it being real lol

Plataform: Sega Genesis/Mega Drive

Genre: 2D Side-scroller, beat-em up?

Year: 90s (probably)

Graphics: I think the first level took place in space. Not flying, but walking on the outside of a spaceship's hull. I also think that later on you got to enter the ship, and there were boxes and maybe an elevator? Character sprites were relatively big from what I remember

Notable characters: The main character was either a robot, or some guy on a mecha suit

Gameplay: You moved left to right in a 2D plane and beat up other robots. There was no movement towards the background like in Streets of Rage or Golden Axe. I think you also had a gun, and ocasionally had to do some jumping to progress.

Other details: I thought it could be Mad Stalker, but that one got ported to the Genesis in 2020 lol. I also thought of Alien Soldier, but I don't believe that's it...

I know it's not a lot to go by, but that's all I can remember...