Crux is also the name for the constellation that adorns the Australian flag, otherwise known as the Southern Cross. In fact, Crux is the latin word for cross.
The logo is meant to represent this idea of getting to the point - the crux of an issue - with the four shapes each pointing like arrows towards the centre, identifying the focus point in the middle. It is also a stylised Southern Cross if you imagine a star in the centre of each of the coloured shapes, forming a cross that tilts to the right. As an Australian company, I liked that symbolism. The negative whitespaces between the coloured shapes also form a cross, relating back to the Latin meaning of the word. Finally, the logo resembles a flower, symbolising growth. And if you think the colours remind you of another company doing great things with technology, that's not really an accident either. :-)