It is quite F2P to the point it is not stingy like most other companies out there. Gacha resources and SSRs are easy to acquire. I get SSR even from friendship point banner too which is supposed to be lower than normal gacha banner. PvE difficulty is also balanced, it does not increase much with each stage. The only issue is the growth factor. You don't get much stat boost with level ups and equipment level ups also give a tiny increase to stats which reminds me of the same issue that Soul Ark Teleport has with equipments ~