Not a historian, but the obvious explanation is that Crete was the centre of the Minoan civilisation, ‘the first advanced civilisation in Europe’ [0]. The only other scripts in use at the time were various forms of cuneiform in Mesopotamia and Anatolia (for Sumerian, Akkadian, Hittite etc.) and hieroglyphics for Egyptian, all of which have been deciphered. We have far more evidence for those scripts than we do for the various Aegean ones.
[0] https://en.wikipedia.org/wiki/Minoan_civilization