Though you've been able to pick it up straight from the source for some time now, Retro/Grade will be appearing for sale in the Steam store on March 20. The game will be regularly priced at $9.99, but will have an introductory sale where buyers can save 10% in the first week.
That ought to generate some healthy sales for the rhythm space shooter, which is good because Allistair seemed to like it. The name always stuck in my head, but it's so generic that I could never really remember what it was whenever it happened to come up in conversation. Of course, now that it will be in my face on Steam with regularity, there's a pretty good chance I'll pick it up.