IMPORTANT NOTE 29 March 2023: This review rating was mistakenly based on an older version of this supplement. I will be amending it to reflect the author's changes and notes in their reply below.
This product has brought me out of review retirement to give my honest opinion and thoughts on this conversion of the Mythic Rules from Pathfinder 1st Edition into Pathfinder 2nd Edition.
A remarkably faithful conversion of Mythic Paths, Path abilities, and Mythic Feats.
The use of Focus Points to replace Mythic Power is inspired and fits the existing PF2 game well.
Persistent use of the term "damage reduction" throughout the product instead of Resistance, except in a few cases where "Mythic Resistance" is mentioned, but there's no indication what that actually means (so gaining "5 Mythic Resistance" is frustratingly meaningless, though I assume it means "resist all physical damage 5 except from a Mythic source").
Some abilities have the Focus trait but no focus point use.
Abilities exist that are nonsensical, or contradictory, or don't quite properly account for the rules of the game (for example, an ability which is a reaction that if it works allows you to make an attack of opportunity, except attack of opportunity is a reaction, and you've already used your reaction, so... it really should just let you make a melee Strike).
As a long-standing fan of the Mythic rules (it's second only to the Kingdom rules for me), I truly want to love this product, but it feels to me as though it was rushed out without a developer pass, which would have caught all of the problems I've found. It is definitely not an overall "bad" product, but undoubtedly will take some work to make it function properly, even though the design intent is very clear in most places.
I would have liked to see some treatment of Mythic monsters to accompany this, as that would have rounded the product out nicely, but I can forgive it if we assume it's solely meant to be the player-facing rules being converted.
Overall, I have to give this 3 stars. It's probably good enough for most people, and I'm borrowing heavily from it for my own use, but the amount of effort I'm putting in to make it actually function within the confines of PF2 is a serious detriment.
[3 of 5 Stars!]