Does HighScore saving work for CRT version
Yes, as long as you have a floppy disk image mounted (if you're using an emulator). I've tested it with VICE and it works fine. Just have to mount the disk image first when booting the game as it auto-loads the high-score table then.
For a real C64 should also work with a mounted disk image via a sd2iec, or a 1541 with a real disk.