ok, first of all, some of the comments down here are dang rude. if you wanna give constructive criticism, at least learn to be constructive and not just mean, jeez.
for a first effort, this was pretty awesome, i gotta say! i really enjoyed the art style of the sprites, and the variances in personality between the characters. as you said in your note at the end, it was a bit rushed in places, but for doing something in one month, that's not really something that can be helped, haha.
i really relate to haru, as i am also a smol trans catboy with trust issues and a past abusive relationship :v but also, lupin really reminds me of one of my very first ocs so i had a huuuge soft spot for him. (not that i didn't like evren. he was great, too. snek.) i would really love to see you come back to this story someday and expand on these characters and the backstory like you talked about. paring down your story is really hard, especially when you have So Many Ideas and these characters live in your brain and you know more about them than anyone else does, so i applaud you for managing to make a coherent and touching story despite everything you had to leave out.
the backgrounds were a bit out of step with the rest of the art style, admittedly, but i didn't find them as "jarring" as a Certain Commenter seemed to, since i was, y'know, reading the story and looking at the sprites. (for the record, my favorite Look was haru's sleep-sweater. he looks. so smol.) also, the backgrounds were obviously something that was simplified due to the time constraint. (is it really that hard for people to understand the amount of work that goes into a game?)
overall! this game touched me in the feels, and i would be absolutely thrilled to see it expanded on if you get around to it (though i know how hard it can be when Life Is Happening). i could tell while playing it that there were elements hinted at that were stories you really wanted to tell! and i want to know them!!
tl;dr - you did a great job, and the only real complaint i have is that now i want to know more about these characters ;P <3