I had to watch this a few times to actually determine what I thought about it, but what I get from this level is that, from the depictions of school, the knife, the noose and the medication, the level represents the euphoria of relieving onself through harm, and drugs as a consequence of experiences at school. Another interpretation I considered is that the protagonist has in fact commited suicide, and the depictions of heaven are the afterlife, the bliss gained from an absence of the misery of life. It can certainly be missed if you don't pay attention, this covert messaging is reflective of how in the modern day, signs of mental health issues such as suicidal and addictive tendancies regularly go unnoticed due to the masking which an individual persues, the song also is reflective of this notion, the completely joyful upbeat song is ironic, telling the viewer "everything is fine" when perseptive viewers know this is not the case. The cyclical structure of the level hints at the idea that this is an innevitable cycle that seemingly goes unbroken as once you come back down from that high you are back in the same place as the you started, possibly symbolising some sort of addiction. Very interesting expression, and I hope you are doing okay if this interpretation is in any way relevent to you yourself or anyone reading, as the ideas the level portray are in no way encouraging such actions, as you are always back where you began after the brief hit.