I like the setting you created quite a bit! The design of the mechanics fundamentals are solid (like you mention, it has clear similarities to the tried-and-true PtbA engine) which make it easy to imagine running this game.
I like the details of how honor and wealth progression look in this game. There's plenty of straightforward sources of character motivations and potential adventure hooks build from them. Details about how the players might interact with the world through a fiefdom can give structure to early adventures too - an NPC's area can operate under the same sorts of rules that players can eventually take advantage of when they have lands of their own.
Nice work, just reading it got me excited to play!