If you were a fan of Space Invaders or TI-83 classic Phoenix, you'll enjoy this: Star Defender 3. In a nutshell, it's a game where you pilot a spaceship against hordes of alien beasts. The description words it best:
Get ready to fight through hoards of alien beasts in Star Defender 3!
The highly anticipated game is finally here! The year is 2743 A.D., only two short years since the last war, and the Insectus have already prepared for their next wave, with new tricks to defeat you.
Blast through 8 huge missions is the most exciting space shooter game.