I didn't think it was on the store yet, just people using beta codes to get it the starter pack should be $10
No, it's already on the store. At least, it was a few weeks ago on the European store. I played it a few times, then grew tired. You die way too quickly, close combat units are also good for medium distance combat. Snipers are useless. Because of all the swaying around, long distance is a no-go (even if you fully upgrade the reduce sway thing) and outside of that you're better off with a different unit.
Read the mania: http://www.fanfiction.net/~nonexistinghero In SA2, it's Super Sonic and Hyper Shadow.