There is also a faceVALUE/GFA course by Volker Janzen and Holger Herzog: http://www.stcarchiv.de/stc1997.php
Unfortunately, those "30 basic games" kind of books were uncommon in the 16 bit era - if such a book exists at all. I only know of one ST book about developing games, "Spiele selbst programmieren" (Develop games yourself). I've got a scan of the book, the disk is already on Dev-docs.
Other than that, there's plenty of source codes available. If you want to type in listings however, I could send you scans of GFA listings that haven't been typed in yet