this game is really good. it uses a mechanic that I have never seen before. It has pretty good play control. I like the art for it, and it has a neat alien invasion feel to it.
here is some stuff I would like it to have: different types of guns, like missile launchers and lasers and what not.
Some kind of infantry module you can buy that would send out guys to shoot the slimes, and more different types of aliens would be nice.
and how about change the background after a while to reflect the damage being done to the city?
any way, good game.