Lowercase a and e look very thick, and too big and round compared to other letters. This is especially noticeable at smaller font sizes. <img width="193" alt="Screen Shot 2020-06-07 at 13 32 30" src="https://user-images.githubusercontent.com/16145903/83979460-5c5e6280-a8c3-11ea-9393-e04ab1976c52.png"> In Fira Sans, the "a" and "d" are approximately the same width. <img width="69" alt="Screen Shot 2020-06-07 at 14 33 02" src="https://user-images.githubusercontent.com/16145903/83980578-d0046d80-a8cb-11ea-8ef7-031c4dab28c5.png"> That doesn't appear to be the case here. The "a" almost looks stretched.