Please enable written reviews in addition to ratings. Reviews are much more engaging to users than simple ratings. Also, in recent updates ratings have been made less visible than before (number instead of stars), please make ratings more visible and add reviews (with possibility of reply from the author).
I second this! Completely agree. Please add written reviews through Gumroad.
Letting users rate other users’ reviews by usefulness and then presenting the reviews sorted by highest to lowest usefulness would be even better.