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It's free! And the source is available!
January 12, 2013 - Charcoal
First up, thanks everyone for the comments, but it's obvious this is going nowhere.
So now the game is available for free on my site: http://charcoalstyles.com/shmup/
In conjunction with this, the source code for the game is available on GitHub (if it ever uploads): https://github.com/CharcoalStyles/SHMUP