There are some things that should be review indeed imo.
1st thing : the way to roll stats. spending 15k diams then buying PNC and praying for 3 good stats is a bit too much P2W ("Added karma system to corruption shufflers, after certain amount of uses, your next roll will have greatly increased chance of being special pool stats & max roll") --> What are those special pool stats ?? There should be other way (F2P friendly) to roll stats after buying items to unlock number of stats possibilty.
2nd thing : there are 3 new items to roll stats while locking 1st / 2nd or 3rd one only but what if you get 2 good stats and only want to reroll one ? There should be items that roll all stats AND items that lock stat when you get one you were looking for.
3rd thing : the amount of arcadia coins needed to build the new stuff. 100k to unlock grandmaster lvls on alchemy and blacksmithing , then 75k + 100k to buy new recipes then 75k per red item and 100k per gold item. That sounds really really to much regarding the amount of coins the ini is droping (7.7k if you get the random amount at max value everytime). We have to build 8 armor pieces and weapons that means 100+ runs to get new red stuff and I don't even want to count for gold stuff. You have to also keep it mind that coins are needed also to craft food / ammunitions for scout / rogues etc.
4th thing : the performance issue causing low fps (especially in the snowy area leading to 2nd boss) but Ryzek already mentionned it above.
Overall the ini is really cool looking, bosses have nice mechanics. I'm looking forward for next expansion.