overall, i like the game... But i think that there should be a more real-ish upgrade system, like that the tank/melee heroes get more health than dps, ranged heroes get more dps than health. And for mages, maybe balanced upgrades and more spells for the milestone upgrades up to like 5. (I have not played for long, only just passed wave 75 as I wrote this, but I just thought that it seemed odd that the first mage you hire ends up with 1.31 MILLION hp at level 24 while your first tank ends up with double the damage and a mere 299.92k hp at level 56...)
well, i quite like the game, however, i would like to see a system where you are allowed to tell them to build and upgrade because that would allow you to focus on certain things such as housing or recreation. but anyway, there is my suggestion, please follow through with it!