Some nice stuff in here.
I made some edits on a bunch of things.
I think your water is a good start but you can bring in the 2nd darkest colour to push it a bit more, give it more depth.
On the rock sides you have a rather nonsense texture going on which has no volume and rather looks like treebark than rock.
The tree is very flat, don't be afraid to have bigger areas on a single colour. Don't work too noisy, which is an easy trap to fall into when working with low resolutions and few colours. Always think about the shapes first, then the texture.
Other than that I think the logo needs some serious work as it is quite bland atm. Bigger letters, some shading and so on.
Keep up the good work.
