Sketch on Mini w/328 only runs once

CrossRoads:

You do know that the Mini may have some differences as to pin numbers (and is there a led?) from say, the UNO?

No it doesn't. It's the same 328P chip. Only difference is that some promini's support A6/A as analog inputs.

My UNO board has a pin map just to tell board pins from 328 pins.

Does the Mini have the built-in led and resistor on pin 13?