This app was mentioned in 15 comments, with an average of 1.47 upvotes
Not sure if this is what you are looking for but theres https://play.google.com/store/apps/details?id=com.turner.castledoombadfree&hl=en (theres also a paid version if you like) you basically defend your base and prevent heroes from rescuing a princess thats on the upper floors of your base.