This looks pretty nice and there's loads of good stuff here - well done!
Two comments: 1) I am really not sure about the resizing hover animation on the buttons (it feels too slow and looks like it goes a bit blurry as it resizes, at least on my non-retina external display); 2) I don't think the checkbox having the tick in it in the unchecked hover state is the right behaviour and will probably confuse some users.