I'll look into it (in a few days), but won't be able to test it, because I don't have a PicoGX. So you'll be the beta tester ;)
Viewing post in Pedrisco (Amstrad CPC / GX4000) comments
Hi! I've added a 1.1 beta version of Pedrisco for GX4000, which now saves the high score and settings on PicoGX (firmware 1.0.5+). I can't test it myself — could you try it? Beat your high score or change the language, then power off and on. The score/settings should come back, and saves/pedrisco.sav should appear on the SD card. Thanks!