Thanks to everyone for the feedback, and for showing your point of view, then, yes the game does not have a unique style, it is difficult to maintain a pattern, even more doing alone and having to take care of so many areas at the same time.
On the clouds, it's just a simple sprite with a bit of opacity, just a test, needs more variations, animations and a better texture to look good.
Yes, part of the textures are from the internet, which I adapted (some took a long time) even though graphically everything is not in perfect harmony, I think you agree that it is better not to have harmony, than to have nothing haha xd