Code given in weekly tutorial videos and code that was part of the provided project.
Websites I used as references in the development of my code:
Having sprites follow the player without being rotated: http://answers.unity3d.com/questions/928197/how-do-i-make-an-object-follow-my-player-without-c.html
Understand how to use sprites in a 3D environment: http://pixelnest.io/tutorials/2d-game-unity/player-and-enemies/
Referencing Sprite Renderer in script: https://forum.unity3d.com/threads/accessing-the-sprite-renderer-to-flip-the-sprite-c-solved.381804/
Having enemies randomly drop items on death: http://answers.unity3d.com/questions/680808/random-drop-rate-problem.html
Used the death explosion provided by IGB100.
Created my own sprites and skybox.