This idle games really won a high place in the graphic and sound. Jesus, they even use the word 'Lament'. The background of each character with the lore of the setting really good if they know how to use it. Unfortunately, they killed it. I mean, you have good assets;materials to develop this game to have an extraordinary story. They just killed it. Their Graphic and Sound and Lore is their main sellpoint, but why didn't they use it to make the game interesting. Good concept, good idea, good theme. Even they use word like 'Memento Mori', 'Lament' that shows this is a story of dark, despair, regret, revenge, and hope. Just a short introduction story at the begining? damn, i have a lament now for how this game turned out.
Gameplay, this is from my point of view, i check the ranking of top players and past party (a function in the game to see what set of party that already cleared that specific stage/level) they used specific characters. The same characters always used in top rank, and it feels like this 'idle' game has a Meta or tier or something. Less strategy needed since the game didn't explain the role of characters and type. But goddamn, retrying until you're successful is a pain in the arse.
Last thing, this game is so expensive. i had a feeling before they would have a VIP system and it has. Typical idle rpg, you pay more you progress more. Everything in shop is expensive, the only good thing to purchase is that one package that give you SR character and VIP 1. Oh, the rate for SR character is 3.6%. They have wish list system where you can choose which character will appear on higher rate. But still, it's sh*t. SR characters in the gacha pool include R 'awakened' character. 300/pull or 3000/10pull and for the game situation now, it's hard to get that many resource.
Like i stated above, Memento Mori has potential but Bank of Innovation just trying to kill it. I'm sure they have plan to construct the game better, and i wish they find that path and plans to make the game enjoyable and fun. Moreover i wish the game can last for at least 1 year. Good luck.