This is a small little game I did. It uses code from various projects and turns out to be quite fun. I put it on codecanyon.com and the folks over there think the source code of the game should sell for $15.
Interested to try it out, download the APK at http://tmeta.com/files/alienLanding.apk
If you like coding, I'm sure you will probably think of a way or two to make it more completed. Here's something I think of.
- Make the gun heat up if you fire too much for too long and you will have to wait for it to cool down a bit.,
- Or maybe you have a limited number of bullets and shooting some types of UFO gives you more bullets.