offtopic I know, but...
I remember hearing about that game before; specifically it's music. Apparently some of the tracks were written by a then-13-year-old Owen Pallett, a Canadian artist who goes by the name Final Fantasy. I had no idea that the game had been released for free, thanks for pointing that out!...back to the topic at hand.
Sierra / Game Arts' Silpheed for PC/DOS. My parents had it on their first PC, which was probably older than I am. I don't think I've ever fully completed it, though. I could get as far as Gloire (the final boss), but that's as far as I ever got. Even when I found and downloaded it last summer, I STILL couldn't beat it.
I've wanted to do a remix of the 'Silph of Wind' theme for a long time, but I haven't been able to come up with anything I've been satisfied with.