I like it but i feel that the character moves to slow, now that might be because of my game and my character moves REALLY fast. I like the main menu It looks really cool, I like the particles in game as well. I really like the load level, Idk how to do that in unity yet but I look for a tutorial on how to do it. Over all I really like your game,.
If you tap the "w" key your character will move faster and if you tap the "s" key you return back to normal speed.
Anyway I used this tutorial to work out how to switch scenes:
Once you know how to switch scenes you can add more buttons leading to different scenes (levels). This is how you can make a main menu and a load level page.