Excellent description of gameplay that provides the information you need when you need it.
-- You might want to add a sentence at the beginning summarizing the phases of play ("There are four phases -- Dust, Draw..." etc.), just to ease the player into the rules structure.
-- You define the limit to discarding cards for resources well the first time (you can discard 2 cards per turn). However, in later rules you refer to the limit as "only twice per turn". I had forgotten the card limit, and was briefly confused as to whether I could discard multiple cards as one discard. You might want to consistently refer to this limit as being able to discard 2 cards for turn.