This is a nice pixel art. Shading in the title and the trees works very well.

Noticing what others have said, I would agree it looks a little squashed from my point of view, but I think this is due to us now being use to GBA screens, whereas this would fit perfectly on a GBC screen.

the trees are on the background not in the background, you should fix that :D

I really really like it, the style, the colors....the only thing is that it feels horizontally squeezed.  Perhaps either extend the horizontal size or reduce the vertical size?  Im not sure what the screen size is supposed to be though so perhaps you are required to work in this size, anyhow i like :P the simple trees are neat