Try copy pasting stuff from the book to a google translate, it should catch things like "criminal minset" instead of mindset on page 26.
About the dice system, this 3+ meant wins on 3, 4, 5, 6. Even you wrote it like that on page 134: "divine item 1+". A change that occurs couse of your "exploding dice" system increases the 50% chance of success (0.50) with (wins on 2, 4, 6) to a (0.60) on every die. Ex. Rolling your max 5 dices, currently makes you recive precisely 3 success on average (0.6).
About your exp system, your 7 lines explanation could lead someone to think that the cost for leveling from D6 to D7 is the same, as leveling from D2 to D3. . Even in a pathfinder 1st ed that has 578 pages, you have a simple table: you look which level you just got, then you read in that line what you have received. I criticized 4 pages, because they make it difficult to re-read a key passage in order to understand the system.
Also google drive link to your solo engine doesn`t work (I think about your 2 year old post on reddit for solo rpg players) Which meant that instead of "deep playtesting phase" your solo mode, i can only wait for your v2 1.0 release.