Agree with other comments about pathing. Really irritating to take 5 tries to walk through a doorway because the character would rather just walk into the wall forever.
The whole boss grind thing definitely needs to change. Made it to the level 50 boss but now my team struggles to kill any blocks within the time limit, so the money coming in basically disappeared.
Going along with the other comments about the final boss, it's skill use is way too random and can be (more often than not) impossible, even with maxed everything. Several times he spawned waves 3 or 4 times in a row and just overwhelmed you instantly, even with using the spells that do really poor damage anyways at that late in the game.
Takes WAY too long to make clones. I'm at the max and it takes days to get them all back after a rebirth. Even worse considering you can't make them without having the game running.