the best kickstart for games is 1.2
in fact there are not games that works on 1.3 but don't works on 1.2
My brand new "Mr. Nutz" was the only one of my non-AGA games that didn't work on a KS 1.2 A500 with 1 MB (512 KB Chip + 512 KB Fast), while it worked on an A4000. Unless it required 1 MB of Chip RAM instead of 512 KB Chip + 512 KB Fast, that means it required at least KS 1.3.