Yeaaaah... after submitting I found out how many people had similar ideas. There was supposed to be a whole story and RPG elements added to this, but since I'm a newbie to Unity/C# I had to get rid of most of it.
I'm not really sure what to do about the trial and error aspect of things. Seems to be how most of these types of games are played.
The music just plays on the main menu. After spending a day and a half on the elements that eventually got cut, I was up til around 4:30am and due to exhaustion and my lack of knowledge regarding the music/audio system in Unity, I just didn't bother watching an hour or two of tutorials to make the music persist like I wanted before submitting.
I didn't even catch the problem on level 3. Thank you for pointing it out. I had a similar issue on level one after initially submitting but luckily a friend of mine pointed it out an hour before the jam closed.
Thank you for all of your feedback! I really appreciate it.