FortSmash is a defend-your-fortress app for Android. Basically you are a noble warrior and you have to fight an ever growing and continuously attacking army ruled by a merciless king. Unfortunately you have only your catapult to fight them, so it’s a point and shoot game where your accuracy is tested.
This is the lite version of the Android game, which lets you play 3 levels (contains no ads) out of the 12 available. It has nice scenery, good action and provides a variety of enemies (sorcerers, magic spells and more).
Download link: http://www.playcolors.com/
(developer also has 2 other games for Android, MoonRocket and GemRush which you might give a try as they seem fun).