With my amd hd7730m, I get 14fps in high, 18fps in medium and 21fps in low. With my intel hd4000, I get 18fps in low.
I think 14fps is playable because it's not like a race game or a FPS, though it could be better (I'm waiting a choice between directx 9, opengl and directx 11, since the kickstarter campaign told there will be all of them).
On steam, it is written Amd hd4850 for the minimum requirement. I think it should be changed to something lower (to give a comparison, directx 9 performance of amd hd7730m is around amd hd 4670, which is more than two times slower than 4850 according to 3Dmark results).
People with a configuration worse than 4850 could not buy it because of that, whereas they could run the game.
