Remember to visit Gravitas on Google+.
An artillery game, somewhat akin to scorched earth, but in 2D, set in space and featuring different planets with gravity you have to slingshot your shots around. Primarily a multiplayer game supporting four local players it’s excellent for parties and an absolute bargain for $1.
Although I may have a slightly biased opinion.
I’ve submitted Gravitas for what will hopefully be a final playtest. Here are some screenshots: https://picasaweb.google.com/s/c/bin/slideshow.swf