Unity Build Size Problem.

I have developed a very basic Snakes and Ladder Game. I am using Unity Version 4.6.1 . I am using only 3 textures files, however the android build size I am getting is 14.2mb. I checked the Editor Log, here are the details in Editor log…
Textures 63.1 kb 1.4%
Meshes 0.0 kb 0.0%
Animations 0.0 kb 0.0%
Sounds 0.0 kb 0.0%
Shaders 0.0 kb 0.0%
Other Assets 90.4 kb 2.0%
Levels 66.5 kb 1.5%
Scripts 236.7 kb 5.2%
Included DLLs 3.9 mb 89.3%
File headers 24.8 kb 0.5%
Complete size 4.4 mb 100.0%

In the Editor Log it is showing the Complete Size as 4.4 MB. But the actual build size 14.2mb.
Is anyone aware of this problem?

There is a minimum initial size for a Unity build.
Build an empty project for the target platform to get an idea of how big that initial build is.

To reduce the size of your build, you can try and set the API compatibility level to .NET 2.0 Subset in the player settings, and if you have an advanced license, also change the Stripping Level settings.

Unity actually have a couple of sections in the manual discussing just this topic.