This game, aka. Probotector II Return of the Evil Forces, is, implicitly, Contra 2.
The guy who has an infinite supply of ammo and who destroys worlds bare-chested is back!
This movie is a 39-second improvement to the previous version, and the hero's gun isn't stuck on autofire.
Selected comments from the author:
At the Final Boss section, I have lost a life to get the normal weapon, because the boss is beaten faster with it.