"Air combat with different helicopters"
Air Assault 3D is an aerial combat game, not a simulator since the controls are very simple and you can easily control them with the mouse.
This game is about knocking down your enemies by shooting from your helicopter that flies fast, goes up and down and leaves like a giant mosquito. Your enemies are a huge swarm more dangerous for their large size than for their great skill, but they are many and you have to kill them all.
It's a free game that lets you have a good time piloting a helicopter without too many complications and shooting at lots and lots of enemy planes.