The UI is straight up maddening to use. The tiered actions have hotkeys all over the keyboard, the tower selection doesn’t have a hotkey at all and you have to use the mouse for it, and the tower display hiding life/gold gets in the way. All the while the game pressures you to do stuff fast. It’s kind of impressive how obtuse this is with so few elements.
I did manage to get through a few levels, and had a glimpse at some of the puzzlier routing stuff which seemed potentially neat, but it was simply too frustrating.