The game is good it sucks when leveling up the characters

The game challenging, stages are difficult. The  only problem I seeis that leveling materials rewards are low and it would take a lot of stamina just by  leveling characters. Also the characters feels weak to play but maube that what make its difficult

The game is fun but it's really annoying playing the same characters over and over just to have a chance to unlock a slight fraction of a character it does become more fun when you get more characters but it really is a frustrating thing grinding for all the characters