UFO Rocks the Stone Age

I decided to test a new schematic for making small games in just a few hours.  The random theme generator gave me "UFO" and "Stone Age" as the theme I had to use.

I was able to make this game in three (3) hours. I was hoping I could add a score and high score to the game. This game is complete for what it is. I don't expect to add the missing items anytime soon.

"Ooga Booga!"
Translated: Have Fun!