Nice work; reminds of something I once programmed on my Roland JX-3P. I'm using this as a transition in a song to make it sound more electronic. I only wish it would linger a bit longer at the end. It seems like the volume cuts off abruptly rather than fades gradually out.
I used this in Saucer Wars - a game for Android phones. Full version here: https://market.android.com/details?id=com.timjeanes.saucerwars.full Free version here: https://market.android.com/details?id=com.timjeanes.saucerwars.free