Firs the big question; is this a BL?

No it's really not. BUT I like this because it is so unique. The author was upfront about that, the novella is a character study for Sunshine. It is a Faustian tale, where the lead happens to have a boyfriend but it really has no bearing on the rest of the plot, it could have been female or male it makes no difference.

This was an art-house piece, it's a stage play in a series, and I absolutely applaud the whole team and their work, especially Atom and Jet, this whole production hinged on them and they put in a solid performance. Adapting this particular novella was ambitious, but I think the director was looking for the challenge, I appreciate that they aren't selling it on fan service, with pointless makeout scenes with overly loud music. There is intent here, and more said in a longing looks than anything else and it's one of the big selling points.

This is not going to be for everyone, and the ending is an open/ambiguous one, but if you're like me and a fan of the off-beat and outside the norm, this will for sure be right up your alley and absolutely worth the time to watch it through, and give the novella a read as well, it's not a big commitment.