I'm currently working hard on a new game, Orbital Defense. It is a tower defense style game where you are defending a planet from incoming meteors and alien ships. You build satellites that will orbit the planet and fire on any enemies that come in range. There are a number of different units to use each with their own pros and cons.
I plan to have a free lite version of the game available and a pay version with the full feature set included. Price won't be too much so if you enjoy the lite version the pay version should be worth. I hope to have these out on the Android Market in the next few weeks!