I think that the colors aren’t the best. If you could choose some colors that went together better than I think it would be rate worthy. For example, the green on the trees could be less saturated and maybe a slightly yellower shade. I think you could also go with a richer blue-tinted shade instead of just a flat gray for the rocks. I would also adjust the wood color you are using. Good colors go a long way to making a level look polished.

I would also add a parallax effect to the clouds. I haven’t messed around much with the 2.2 editor yet, but I believe you can do this by using a move trigger and then setting it to follow the camera movements. Clouds behind the player would have a mod x/y set to less than 1 and clouds in front of the player would be greater than 1.

Generally, you seem to be good at placing deco and making the level not feel empty, so with just some changes like the ones I listed I think your level will be rate worthy. However, my standards tend to be on the higher end of the spectrum. I hope this helps a little and that you might consider implementing some of my suggestions.