Honestly, I'm not expecting to see Alvy's route will be continued in the future, because he's a side character after all no matter how much I love him :((((( However, I really really wish we could have an alternative happy ending for his route or just some minor adjustments for the current ending to make it less tragic and brutal, because this is just too much for me frankly....It's been like a year since the last time some visual novels can break me...(By the way, I swear, your writing and arts are peak in this update...I really don't how to say this, nhưng thực sự nó quả là một tuyệt tác, một tuyệt tác, nó khiến cho tôi thực sự phải dùng tiếng mẹ đẻ để nói, bởi tôi chẳng biết phải nói bằng tiếng Anh như thế nào).
While I agree that the ending was... a lot, I also think it did need a rather sudden and extreme ending, to really hit the audience with the point that that is the end of his route entirely, among other things.
Obviously, Alvy will still be around, and may return in Scribbles' route or Chapter 2; he will still be part of the story, just as Therium is a constant annoyance presence, even though he's no longer the focus of the route, but for one reason or another, the author has decided that this is where his route ends. My assumption is it's because he's such an integral side character that actually having a route for him would (most likely) continue to completely change the story from the way the VN is now—it would no longer be focused on a fantasy romance academy story.