Heli Attack 2

In this side-scrolling shoot’em up you play as an elite soldier whose plane
was shot down and now he is hunted by enemy helicopters. The attacking
helicopter is flying above your head and the gunner is firing while you avoid
his bullets and try to shoot the helicopter down.

The goal of the game is to earn as much points as possible. Each time you
destroy a helicopter another one appears immediately. This procedure continues
until you have lost all of your energy, there is no time limit. Some downed
helicopters drop health packs or weapons like a rocket launcher, flamethrower,
shotgun, or the mighty A-bomb launcher.