Massive flaws.
I hate having to redownload the whole game after every weekly update.
The pulls are absolutely garbage, and even getting a SSR Quality Mold item is only a 60% chance of SSR!? In every other game that would equal a guaranteed SSR pull. This is downright absurd.
All of the items in the cash shop are ridiculously expensive, with little to no value for the price.
The story writing is a mixed bag. Most of it is lazy and bad, but there are hints of something interesting within the world they built, they just don't know how to flesh it out because they're too busy making cringe harem dialogue for the player to be smothered in. All of the tropes are there. Yes, ALL of them. And they suck here too. Really off putting.
Gameplay is bugged, with characters holding their weapons by the butt-stock, if they're even holding them at all.
Progression is a vertical wall with no climbing gear, and you have to literally wait days or weeks for your idle EXP to accumulate so you can level up just to get stuck at the next battle. There is no way to grind exp or currency, you HAVE to wait. This is boring and puts me off.
Oh, and did I mention that I hate having to redownload the game after every update? Yeah, that's a thing.