Level: SILENT OPPENHEIMER
I honestly don't know what the level was about, but it has a strong atmosphere that doesn't need context to have you immersed. The level name didn't help either. The player starts above ground, but not after long you go down in some sort of magical cave with bright lights and structures seemingly made of bricks. The animated background, I don't know how else to explain it, is there for practically the whole level but I don't know what it means. It seems to be a reference to something though. Overall, even though I can't put a word on the theme, it's consistent throughout the level. Regarding the songs, I've not heard any of them before so I don't know if they have any connection to the level's meaning.
(after reading)
I don't really know anything about the show, but apparently the level was themed around Made in Abyss. I assume the background thing I was talking about earlier is the "laser effect" that feijoaoa mentioned. Since I don't know anything about the show it's hard to tell much about if the level reached its goals or not, since the goal seems to be to make a passion project for Made in Abyss, in GD. I think most players don't know the context but I can confirm it's still very much possible to get something out of the level. I don't know what ideas Feijoaoa wanted in the level, but there didn't seem like there was a desperate need to include too many ideas into the level, so I think he managed to implement all ideas he wanted. Honestly, I think this is one of the most perfect levels and can't think of anything to improve it without knowing more about Feijoaoa's intention and without knowing aything more about Made in Abyss.