No, not a security app but a fun, free game.
Data Defense is a minimalist tower defense indie game set in cyberspace. Protect servers from being infected by a slew of oncoming glitches, bugs and viruses. Use each server's particular layout to your advantage, installing defense programs in strategic locations to defend the server in the fastest time possible.
★ No Ads or internet connection required!
★ Create and change the path by installing, selling and upgrading your towers
★ Over 50 different maps and challenges
★ Customize your strategy with 30 different towers
★ Enjoy both Campaign and Survival modes
★ Loads of unique enemies that will put your defense skills to the test!
★ Amazing ambient music with over 15 tracks
★ Hours of gameplay!
★ Beautiful vector art
★ Amazing physics driven particles!