Another good fact is in the other fight area. Having it on auto mode allows your clone cap to drop which allows you to use those clones in other areas. Leaving it on while you work on other stuff makes things so much easier than clicking them yourself for fights.
I don't know why the top comments involve things on the final boss. I had everything maxed out, all achievements except for 1 and all upgrades except for 1. Took me 1 time to pass the level without much worry. Went to survival and got Overlord with 10 mil in 30 minutes and only stopped because I was bored with the 2000+ kills. Fun game overall, but wasn't exceptionally too tough ever. Did do a lot of farming to max the characters though.
For anyone who is passed the first season, we know that the game gets easier and more fun. For those who haven't and complain about it, finish the first season and you will enjoy it. If you don't like it still, then please do us who want to play and the servers a thank you by leaving. It's a good game if you put the time and effort into it. Practice makes perfect or at least, an easier playing experience.