The game Edge Grinder for the Commodore 64 is now available as a .d64 image. The game is made by T.M.R, the graphics are from Smila and Ste'86 and the music is made by Odie. The game about scoring points, blowing things up and grinding the walls. The alien craft attacks in waves and have varying strength values. You will need to learn these attack formations in order to succeed.
Edge Grinder video on YouTube.