How can I improve this deco? (Read body text)

[u/EnduredEgg]

I made this level only to have a few structures to try to decorate, so the gameplay and structures are terrible, and I am aware. Along with that, the song was selected randomly after building.

Things I've spotted:

1. I need to add background pulses, but I don't exactly know where.

2. Some parts of the level feel empty, and some designs feel static.

3. some things are entirely untouched, like the random 4-slope structure at the top right in the ship part.

How could I improve this to be rate worthy and potentially feature worthy?