What a game! First of all, it looks amazing and very pleasing, I love the pixel art and the lighting very much.
If you need some feedback, here's mine: I think the player should not be teleported back to the beginning of the level every time he dies, it is very frustrating. And I also think it would be awesome to give some audio feedback on jumps (and maybe different sounds for small jump and the big one - I might be wrong but from what I've seen it depends on how much you keep pressing the space button).
Other than that, you did an amazing job. The fact that you did that much art in one week, man that's hard... Congrats!