Looks cool, but if you got a decent tree mesh (something with the branch mass off-centre so you can randomly rotate it to vary to way the trees intersect), a larger and varied ground texture that tiles over a bigger area (tiled over about 10x10 of your current tiles, grassy texture with dead areas, leaves, branches, mud etc..) and put a skybox behind it all (with some faked distant foggy tres rendered into the skybox) it would look amazing.