Its cool that you understand the importance of low-polygonqal models for games,but they dont have to be sooooo low poly.
-The trees looks bad because,4 faces
-The texture are not sharp,they are all blurry(right word)
-Try hidding half of the background with montains or something else
-Try adding more details to the level,it loos naked.
-Waterfall,Try adding some smoke effect.
-Try making some noise on the floor,it looks too flat
-Try to add transparence to the water
It dosnt look that bad but there´s still much to do.
Dark-Angel
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Just a fan of art!