Siege Hero is described as 'captivating puzzle game with terrific cartoon art, lovable characters, and life-like physics'. There are more than 10 games similar to Siege Hero for a variety of platforms, including Android, iPhone, iPad, Online / Web-based and Android Tablet. The best alternative is Angry Birds (series). It's not free, so if you're looking for a free alternative, you could try Bloons or Crush the Castle. Other Siege Hero like games are Goat Simulator (Paid), Monster Balls Smash (Free), Catapult King (Paid) and Ninja Dogs (Free).
Angry Birds is a video game franchise created by the Rovio Entertainment game developer. The idea behind Angry Birds is simple: using a slingshot to fire birds, you must destroy the fortified castles where the pigs live. Represent entire series of Angry Birds (series) games.
The King has ordered you to crush all resistance in order for his kingdom to survive. Crush castle after castle by wiping out all of it's inhabitants with a powerful Trebuchet and an arsenal of 8 different projectiles.
Monster Balls Smash is an arcade puzzle game with realistic physics inspired by my love of cartoons, angry birds, monster films and comedy destruction. It's easy to pick up and play and ideal when your bored in queues, commuting or generally waiting.