Minor, but -- I got the third tier Feat for plant-gathering without having done either of the first two tiers. And I got it while digging a tunnel. Without plants. (I think it just triggered when the third-tier gravel-and-soil-gathering one did, but it still made me laugh )
Even more minor, but -- this brick layout isn't physically possible... but I think it would be if you flipped a couple of the faces across different axes. In the screenshot if you flipped the top face right to left, the brick edges would line up.
(I only noticed because I've been admiring the textures in general!)