We really appreciate all the work Purescript has done. Hamler is still in the early stage of development. We have made some changes on the front-end to introduce some built-in Erlang data structures and syntax sugars, and we are planning on making more changes in the front-end. The initial plan of the language was for the company’s internal use and later we decided to make it open-source hoping to communicate better with the community.

I agree. And only mentioning PureScript as the "base" in one place on the webpage is not giving PureScript enough credit.