Gun Force 2 - 2 Player Mode (MAME)

In GunForce II, players take control of Max and Lei through multiple stages battling against enemy soldiers and aliens, while rescuing POWs and collecting medals. Once again D.A.S., the persistent antagonist organization from previous games such as Air Duel, Undercover Cops and In the Hunt, threatens planet Earth and it is up to Max and Lei to stop D.A.S. GunForce II is the fourth and the last installment of D.A.S. Tetralogy. It is considered a spiritual predecessor to the Metal Slug franchise by SNK, as the first title in the series bears many similarities with this game and it is also sometimes referred to as "Metal Slug Zero".

[@Chaoktarukto]

Metal Slug!?!?
(yes I read the description I'm amazed at how similar the design languages are)