Credits to: João Lopes - Design and Development
Unity 2D Space Shooter tutorial http://www.pixelelement.com/blog/unity-2d-space-shooter-tutorial-part-1/
[followed to understand how to deploy enemyspaceships and move bullets toward player ship and vice-versa]
AssetBundles and the AssetBundle Manager https://unity3d.com/pt/learn/tutorials/topics/scripting/assetbundles-and-assetbundle-manager
All the code was writed personally by João Lopes, using the tutorials to read, understand and learn all the mechanics.
Time of Development: 15 working days
UML: http://aimtothe.space/unity/Exercise2/unity-shoot-em-up-game.pdf