And besides if you look at the games, all are for AmigaOS and MorphOS but none for Aros. Aros is too slow too?
No. The reason is that they don't have a working cross compiler. The only reason Ace of Hearts, Voxelbird and Voxelnoid exist on MorphOS is because I searched and found a working cross compiler for them. Maybe if you ask them to port to AROS and show point them to a working compiler they will. Asking politely actually works
As for 68k, well, the programmer told me that it might work for a PPC equipped classic Amiga as well. But I doubt "even" a 060 @ 66 MHz would be enjoyable.