You can play the best looking version of Ghostbusters on your Amiga if it's AGA and has a 030 or faster CPU. You just need to install AmiMasterGear from here - http://kung-foo.dhs.org/zener/AmiEmulatorsWeb/index.htm
And download the Ghostbusters Sega Master System ROM! The game was enhanced for the Sega and features nicer graphics than the C64 original and maybe a couple of other improvements too. This is how I've been playing this awesome game on the Amiga for years, and although it might not feel exactly the same as the C64 version, it's definitely just as good or better. And AmiMasterGear runs much faster than any C64 emulator on the Amiga, so more people will have a chance to try it (it runs on an A1200 or CD32 with Fast RAM too, if you have one, just a little slow).
When I read this post I spat out my tea all over my monitor and simultaneously shat myself. Surely you're not advocating piracy? Piracy makes me sick. It funds terrorism. It kills kids.
