Here is a small sample from my game:

I am not relay happy whit my result, its look good one way, but also looks empty. I don't know why! Help my, maybe i just working on too long.

It looks empty because it is empty. You don't have any challenge beyond navigating. Add in some moving objects, traps, puzzles, ect... Make the levels more engaging than just jumping from platform to platform.

I like the art style and it has a lot of potential.  The trick is to find a good middle ground, you don't want it too busy either.