nice app, one thing i don't like is the stained glass as water, because it wasn't done properly, id suggest having 3 layers of stained glass, light blue, blue, light blue, so it gives more of a blur effect, and make sure some of the glass goes over the mountain, in the end you can just cover the parts of the mountain that were covered by the glass in sand. good luck!

u need proof for your builds, but assuming they are your builds, they look good to me, gl with ur app