The question is not whether Anglicanism is or is not Protestant, but whether or not it is Reformed. Certainly Robert Cranmer and his generation were distinctly Reformed in much of their theology and that influence remains to this day within various segments, especially the Low Church, of Anglicanism.
Reformed however in which way? Since the Reformed tradition is thoroughly Protestant, then the question truly is whether or not Anglicanism is Catholic or Protestant.
The thing is, Anglicanism is Catholic and protestant, but not Protestant. We acknowledged the abuses of the Popes and the Church based in Rome at the time but unlike in Protestantism, we did not throw the baby out with the bathwater. We kept sacramentalism, valid bishops and Apostolic Succession, Real Presence theology, use of Deuterocanonal Scripture, traditional liturgy...and all things that make Catholicism, Catholicism. We did reject things like Transubstantiationism as a dogma, papal polity, cardinals, the pre-Tridentine/Tridentine idea of purgatory, Treasury of Merits, etc, but then again, the Eastern and Oriental Orthodox also reject them, and they too are fully Catholic.
Evangelicalism, or more accurately Open Evangelicalism, within Anglicanism is an entirely different creature than Evangelicalism in Protestantism. It is an emphasis on the more reforming aspect of Anglicanism that restored preaching and the primary place of Holy Scripture and which chooses not to partake in many of the optional practices like Saintly venerations and use of full vesture. That is the basics of it.
Here is a link to the Reformed Episcopal Church website -
The Reformed Episcopal Church
They are not part of the Anglican Communion. They split because of a rejection of the Catholicity of Holy Orders and baptismal regeneration.
So overall: "Congregationalists" vs "Presbyterians" is just polity, while "Congregationalists" vs "Reformed Baptists" is doctrinal, and "Reformed" vs "Episcopal" is pretty much all of the above.
There are three major types of church polity: congregationalism, presbyterianism, and episcopalianism.
There are also actual denominations called Congregationalists and Presbyterians. There are many churches that use the word "episcopal" in their name, such as my own The Episcopal Church, a member of the Anglican Communion...and there are some denominations that use the word "episcopal" as well, like the African Methodist Episcopal Church.
Within Anglicanism there are three emphases: Open Evangelicalism, Hookerite Latitudarianism, and Anglo-Catholicism. There are also wannabes called Crypto-Calvinists/Presbyterians and Anglo-Papists, who are Anglicans "in name only": the Puritans were Cryptos and many of the splintered Continuing Church bodies (Anglican in heritage but not in the Anglican Communion) are Anglo-Papist, such as the Traditional Anglican Communion.