This game is well executed and polished. I liked the variety of towers but I wish there were a short description of each so I new how to use them properly. I'm curious, how did you get here from the theme?
It began with the idea of 'take care of someone else', soonely we thought about an antivirus who takes care of an computer, and the tower defense genre just fitted very this theme, since you just have to take care/protect an objective.