Actually very good gacha game, you have plenty stuff to do, nothing mandatory, possible to have good hero roster in long term without donating, catchy side stories, somewhat unique gameplay style. Campaign is interesting and feels easy until one point where difficulty ramps up and feels like game force you to donate, but at this point I had enough currency from daily activities to buy weapon and "meta" hero to continue. Music is ok. Side-stories is awesome and one of them made me drop a tear. Ingame events feels very repetitive, but still reward something.