Great work!
I love this kind of atmospheric games. Like others said: The charakter is awesome! It's got a very sympathetic look (I like the jumping too!). I was thinking of some things that could be improoved:
Better grass-sprite(are you using an alpha tga-sprite?)
Tweaking some more on the watershader.
Using one ore two more tree-models.

Hurry, I want to buy that game!!!

My try:




screens