As a developer GameArts are known most for their work on the wondrous Grandia games as well as their input to the Silpheed series, but they've also produced a rather well wrought selection of mecha games too.
So: great 2D mechagame, has some truly insane and fun gameplay mechanics, great title, supports indie developers, maybe a tad too easy if you're badder than the average badass, COSTS ONLY A DOLLAR.