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Playing full screen on a retina macbook it's impossible to move the mouse cursor down to the bottom inch or two of the screen, making it impossible to click dialog boxes or even finish the tutorial.

It looks like it might be usable in a small window (1366x768, say) but that's really pretty broken for a game that was released last August.

Checking the developers forums it looks like this was a known bug as of last September, but they don't look like they were planning on expending any effort to fix it. (One suggestion they have is to play on Windows instead of Mac. Right.)

Avoid.
What about changing your Mac's screen resolution?