Introduction
At this point, you should have created an entire project, but taking the time to get the projects out into the world is just as important. Playing the game inside the editor is nice and all, but playing the game as a standalone title has a special feel to it that you can't duplicate.
After exporting it to the computer, it is possible for you to just zip it up and send someone that file, but you spent quality time on your project, and so, give it the respect it deserves. With that in mind, people notice the polish that is put into games and the little things, such as an installer, can help get people into the mood of your project early on and see your game as a professional title.