The game has a solid concept and a lot of work done for a week, about the audio it was nice but maybe you can try using some addition to it, like making it faster when monsters are near.
For your first time doing pixel art it was really good, i remember my first ones and they were awful.
If you want to keep going with pixel art i recommend you to start using (if you already dont) a software like Piskel (this is the one i use) or Aseprite and working with layers, that will help you a lot with animations, also try to check out Pedro Medeiros tutorials they are awesome.
Good Work! keep going!