Counterintuitively, all of the aoe attacks and items are terrible. All they do is kill off the weakest enemies and leave the strongest ones alive. Since only one enemy can attack you per turn, the best strategy is to leave the weakest ones alive to decrease the number of "turns" the strongest ones get. The only time I used aoe was against packs of very strong monsters... Game needs a lot of work. The foundation is solid, but there is no actual strategy to it.
It isnt the font, its the size. I zoomed in to read it, but larger pop up text would work wonders. Also, WC3's gem TD had towers that buffed towers around it, or debuffed enemy armor, and that is part of what made it interesting and fun at the high levels (organizing your maze for maximum tower coverage but still staying within the auras.) Being able to move the towers anytime you want trivializes planning a bit too.
I wish customers would ask for the items they want at an appropriate rate for the specials, and not have 20 healers come in asking for my single brightest staff that I am obviously saving for a high level quest. As soon as I sold it, they stopped asking for it. As soon as I got another one, the spam returned.