Improvements - incidental music

When making the first draft of the documentary, I used music from royalty free websites to create atmosphere and mood. To improve on what I have already found, I would like to use music covers that people have created from video games as well as attempt at creating my own music on garageband. To give myself an idea of how this would sound with my documentary, I put together some music I found as well as my own music I created in time to the ending of my documentary using Windows movie maker;