I disagree with all the other comments about this game. I throughly enjoyed it. Just because it is a 2d game in a low resolution does not mean people should dismiss it. I like the old school charm about the game, exploring the maps and finding different routes and weapons.

I didn't like this game one bit. The graphics were so old school, and the gameplay was pretty bad. If you want a quality game, make sure to get away from this as much as you can...

Aiming at the aliens was a little awkward. Computer independent gamespeed would've been nice. An OK game that could use some better designed levels. The author has made a much better, and similar game, called Meteor. I recommend you download that instead!