Not so simple but pretty engaging action defense game. You have to defend your castle from crowd of different creatures. Your main weapon is fireballs that become more powerful with each game level.How to play:- Touch screen to shoot fireballs;- For better result aim in front of the creature;- You can choose one of 3 defend towers - slow and powerful, fast and weak or balanced tower;- Upgrade your fireballs and castle with earned score;Features:- 20 different maps;- 9 types of creatures;- 3 towers;- 6 upgrades;- Nightmare mode;- No In-App purchases or paid content.If you like such games as "Defender", "Paratrooper", "Zuma", "Angry world" you should definitely try "Simple defender" too.