Thanks for all replies, helps me a lot and gives me prof that it is worth to finish another non commercial/free game

Thanks a lot for all good words.
Those shadows helps me reduce palette and adds another few new colours in 15 colour palette.
I was thinking that best idea for those clouds would to add little shadow on the bottom to make them more contrast. Clouds would be moved in a diferent speed, Would be another layer, some sort of paralax.
Some mockups after few small changes.
