Game is about just killing aliens(?) with your gun, going through the map left to right, there was some stories about it, and at the end of the game you transformed into some cyborg/alien kind of guy, whilst saving one of your people

I remember some of the games start, and end so I'll list those (same franchise)

1st game:

This is where a marine(?) protagonist goes to an aircraft kind of place, where his people got attacked by aliens(?) I think, you get a gun a bit later and then just kill enemies

3rd game:

This is where you could free-aim your shots, there was an annoying side-scroller part where you used a ship to navigate through obstacles IIRC

4th game:

Gameplay wise it's the same as the 3rd game, but you got transformed into an alien/cyborg(?) and saved your buddy, maybe the map was on hell or idunno (it was red-ish IIRC)

There might be only 3 games out there, not 4, but I don't remember it, I was like 10 back then.

Please help!