Laly (the creator of the game) actually said she put in that ending bc she felt like she had to put multiple endings bc other vn's have multiple endings. She didn't like that she put it in bc it's not there for significance to the story, that it's more just there to be there. She talks abt it on her Tumblr 'where-sparOw-barks' :)
Personally, I don't consider it canon bc of what she said, but ofc what you consider it is up to you :D