Wow. I'm floored.
Spoilers for the game ahead, please try to play it first.
Just finished it.
I really didn't expect this. I was... honestly groaning at first when I saw the GF was a typical Yandere who overreacts, and thought that the title was about her after all, not the protagonist. But the twist of the Protagonist actually liking Gore and taking the murder as a gift was enough to let me back in. I laughed at first of confusion, but then came the other endings.
I think it's a good deconstruction. The use of repeat playthroughs was chilling and well-done. I particularly liked seeing the change in perspective of run 4 and 5.
I think it's the first time I actually saw the Yandere trope used in a meaningful way. Showing her as someone who can understand the protagonist's most shameful desires and be there for them, only to have the different perspectives of run 2 and 4 snatch that away, show that you can have friends who are disgusted by gore and violence but who will support you because they know you're good, or other people who like taboo stuff and will bond with you over it.
The result is to show that, no, the love of a yandere is unhealthy, even there. There can be no ending as long as she is around.
The mental deterioration of the protagonist was well done too. The background becoming fuzzier, the loops... the constant smiling without saying anything was creepy. There is that sense of guilt, self-hatred piling up. Ash was relieved to find someone who would understand them (even if finding the murder of your best friend hot was a bit out of it) only to have to face what they said in the new context... and wanting desperately to end this.
The ending is bitter.
...
...I liked this. It was much more than I anticipated.
Thank you. I'll probably let this... sink in and get the sequel.