SPOILER
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Just my two cents, with a bit of renaming it seems like:
- level0 is a starting point for the game
- level1 is the field with the sun and the tree
- level2 is the room with the pc
- level3 is the dark field
- level4 is the girlcorrupt
I think that the game is all this, "alway near" is the meta-jumpscare and level4 is a legit one.
There is no level5 etc, so... it's unfinished.
I don't know what "school" is, maybe a hint for the sequel.