I found the links to some of those games.
Magic Ball -
http://retrokomp.org/pliki/magicballadf.zip
Charly the Merc -
http://aminet.net/game/shoot/ctm1a.lha
Charly the Merc -
http://aminet.net/game/shoot/ctm1b.lha
Charly the Merc -
http://aminet.net/game/shoot/ctm1c.lha
Death Is On The Way -
http://aminet.net/game/actio/D1.lha
Death Is On The Way -
http://aminet.net/game/actio/D2.lha
I'm pretty sure that Banana Islands game was written in Amos before he wrote Backbone.