This app was mentioned in 2 comments, with an average of 6.50 upvotes
Cyberspace Defender - This honest little tower defense game from Gingerbread era got an update after 4 years! Seriously. The author ported it to Unity and remade the graphics so it doesn't run like crap on modern devices (what bothered me immensely).
Being an very old game there's not IAP, forced waiting times, Play Games nag screen or social media buttons. You are just two taps away from playing.
Joguim sem frescuras:
https://play.google.com/store/apps/details?id=com.eekgames.cyberdefense