Is it OK to use CD media not with a circle shape but with such a special shape as a star, heart, etc.?
You cannot use specially shaped CD media as they may cause problems to your computer.
PGC-Z505VA "CD-ROM Drive" Manual
Only use discs with a circle shape. Do not use discs with any other shape (star, heart, etc.), as this may damage the CD-ROM drive."
Instruction manuals of computers equipped with CD-ROM drives and those supplied with CD-ROM drives have the descriptions as above on the page of "Playable disc".