I wrote a space invaders when I first got BMAX about a year ago to learn it. It uses graphics from different arcade games. It is not complete but is playable. if anybody is interested, I can email the source code. It is not well documented but I don't think its that hard to follow. you can download the executable from here:
http://www.gamedev.net/community/gds/viewentry.asp?projectid=411660
http://www.gamedev.net/community/gds/viewentry.asp?projectid=411660