Invasion UFO3.0

Invasion UFO is an interactive screen savers and Arcade game features mini alien creatures image and other cartoonist characters. It displays and plays itself as default screen savers, and if you would like a piece of action, simply hit the SPACE bar to start the game and take over the control. Remember, you suppose to stop aliens and UFOs from invading the earth. If you fail the B-17 will take over. Sounds fun? You deserve a 10 minute break so try it. It certainly will crack a smile on your face.
Alternately, when the screen saver is not running you can click on the Invasion UFO icon on your desktop to start the game. Your mission is to defend aliens from descending to earth with aircraft missiles, and occasionally you will see fast flying alien aircrafts flying overhead and it is a big bonus if you can aim high and shoot one of those down. Be careful though, those high flying alien space crafts are often chasing by friendly aircraft as well. So make sure there is no collateral damage. You can use tanks as cover and concealment but it doesn't do you any good if sitting duct. Remember, you suppose to stop aliens and UFOs from invading the earth!
The trial version contains only one module with shareware logo reminder. The register version has multiple modules. How many level are there and what is the highest score remain to be seen.