It's not blurry anymore! Not sure if it had something to do with running the Yosemite beta, or perhaps it was on the resolution, but it's clear now! Woohoo!!!!!
It still gets blurry on non-native resolution, but I'm not bothered by that.
One remaining niggle (I haven't gotten far in the game) is that the tooltips are still cut off. Is there any way to fix that?