as this thread said some texts are overlapping during the game, including the main menu which was fine when I entered the game at the very first.
game version: 1.25(steam)
platform: osx yosemite 10.10.1
machine: macbook pro retina(2880x1800 resolution) (i guess this occurred this overlapping problem since my friend using a regular resolution macbook is just fine)
update:i fixed it by closing steam overlay