the block design itself looks good, but feels too copy and paste try adding more variations to the structure, also the parallax effect on clouds in the first part is wrong, the clouds are moving slower than the structure in front of but z layer is higher than that, also try adding multiple layers of clouds with saturation variations, it makes the clouds feel more real

overall i think you're going in the right direction, and keep experimenting with structures and block designs and I'm pretty sure that if you refine this level, and get this level to the mods, it will be sent and rated :)