There is a great choice here. You can play asteroids or shoot at random cities from space.
The lack of consistent unit use (ft, km, mph) is distracting,
Clint Eastwood is much easier to do with darts, just stack the bodies out (preferably bosses) and then hit them repeatedly until 100 hits. The big bosses take about 15 hits to mash. Best part is they don't move.
 "Billy the Pilot"){kind=icon}
 "Insectonator: Zombie mode"){kind=icon}
 "Curl Up and Fly!"){kind=icon}
 "SAS: Zombie Assault 4"){kind=icon}
 "Bullet Heaven"){kind=icon}