So... I've only done one playthrough so far, but I noticed a few odd things. First of all... it's clearly intended to be player-choice based, but enough of the story is linear that you kind of have to... figure out parts of the MC's personality in order for your choices to make any sort of logical sense. It's more like the player is trying to get the correct answer than trying to roleplay a character they've created, which is further emphasized by the fact that there are apparently bad endings.
Which brings me to the next thing -- that's... not a bad ending. It may just be because of what I said above, that the MC definitely does have a personality and not just what the player creates for him and they may not mesh very well, but I really feel like a relationship between the MC and Diego is a pretty toxic relationship, so them "breaking up" (not that they ever even started dating) is probably good. I get that Kyrex isn't actually a datable character, but honestly? Myself, I'd just start dating Kyrex in that situation. It's also pretty weird that the MC doesn't realize he's Diego's ex, because that was really obvious to me. No reason to give up and take the bus home just because your best friend has relationship issues that you don't understand how to fix and end up making worse.
It's also evident now after getting to the end that the side-stories really are *not* side-stories that are only there for full completion, but actually have a huge impact on the storyline and it's very relevant that they must occur before the main storyline if at all. This wasn't clear to me initially. I guess they're only considered side-stories because you still do have to do the main storyline, regardless of whether you do the side-stories or not?