To the developer,
Seriously? Do you think people asking for upgrades are idiots and didn't click on a tower and notice that you can level up towers? What we want are upgrades that decrease costs, increase damage, increase fire rates, unlock better upgrades for the towers. Before you comment with your patronizing remakes explaining how to level up towers, think.
Great game. Most definitely a 5/5. My only problem is in order to upgrade your minions they have to gain exp which makes it hard to keep my minions even.
Thanks for your help.