New release on dropbox here.
This fixes the A500 Mini version to run on the v1.1.1 firmware. It also fixes the performance problems with World 3-3. Also WHDLoad versions now have a nicer icon.
It seems the A500 Mini now needs a .uae file alongside the .lha file. The old version would run as long as you entered the menu for it first (which generated the .uae file). The whole system with both a json file and .uae files is a bit of a mess if you ask me...