Click on a tower to be able to place it, then click on the radar where you want it to be. Win to win. If you beat any level of ratpocalypse respond about it in comments.
Thanks to @TheMechanoidAndroid, @meBonkers, and @sniveeey for play testing, thanks to @MusicMaster_1 for the music, go to his youtube channel, https://www.youtube.com/@TheEDMLemon.