Editing my last comment:
Moreover, if you set the autoprogress button on and you reach a level u cant beat, you will come back and then get stuck on this level (as long as you were afk) where you are gonna receive less gold than in the xx4 or xx9 ones.
Which is the purpouse of the first level in every stage?? it has no sense, it is easier than the last one which goes before the last boss (the xx4 and xx9 I mean) and gives less gold than these, so why have u created those useless levels??
Tip: set ur formation in the highest stage you've reached, even if u cant beat it, and go offline, u will get more money than grinding the previous stage
There is a point in this game in which gold drop by monsters and their health are not proportional to the damage increase, even if u have a lot of idols
In the end you will use the same heroes, the dragon brothers, the princess the lion, the barbarian, the chaman, the tree chopper, the panda and the detective
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Glad it worked out. =)