I'm a really big fan of the added initiative system and player-rolls-all-tests-in-combat rules, but I think my standout favorite is the spellcasting here which is so neat and elegant.
The layout is great - super readable, thematic, evokes a strong old-school-new-twist feel.
The procgen for generating characters is a wonderful example of gameable lore and the expansion of the skills to archetypes is awesome!
I think this project deserves a bunch of one page adventures to go along with it!