AmiBlitz is the latest Amiga version of Blitz Basic since it was open-sourced by the authors. Maybe that would interest you in coding some simple games for the A1200. BlitzMax it isn't, but it should get you started.
What I've been doing lately is trying to port classic Amiga software to
SDL in C so that it will work on the next-generation Amigas as well as other platforms.
My current projects include
Total Chaos and
Mattathias Basic (a sequel to AmosPro).