Space Ranger: Buzz Lightyear's Galactic

You control Buzz Lightyear's ship, moving it with the mouse to aim and fire at waves of enemies that scroll onto the screen. The main goal is to survive as long as possible and rack up a high score. You have a standard laser shot, and I recall a bomb you could launch to clear the screen when things got too crowded. Getting hit by enemy fire drains your life bar, and I think accidentally shooting the friendly little green men also costs you health. The pace is steady, with the difficulty ramping up as more enemy types appear. It feels like a basic, responsive arcade shooter that gets your reflexes working for a few minutes at a time.