Feels like it takes way to long to upgrade a single character, the crossover quests are either to hard or don't give any rewards, constantly feeling like the units I have do no damage to any of the bosses at all. It could definitely be much better if it didn't take forever to get a unit from lvl 1 to around lvl 100, Exp potions should give more, quests should drop more items, getting a unit up to star 5 shouldn't be locked behind God quests that you can't do without maxed out characters.