So overall, I really enjoyed this.
It was very sweet and the dialogue felt human in a way you don't really see in these games very often, so major points for that.
I really appreciated the hefty use of different frames to show even minor shifts in facial expressions and body language, I realize it must be a lot of work in the long run, but when creators instead default to the player literally reading another character's thoughts it kinda bothers me for some reason. It's one thing to do it in books where you're more detached, but games where you "are" a character I feel are not the best place to use it. So, again, major points for putting in the extra work.
The piano tune, while lovely, did get a bit grating after a while, and hearing something so romantic in spirit felt a bit off-putting to me when MC is talking about how his plague-ridden parents wandered off into the woods, leaving their only child behind and all alone...
I was very happy to find that the primary love interest has a bit more of a comely appearance, rather than the sharp cheekbones and intense eyes of a supermodel. Seriously, I'm really liking your style with a lot of this stuff and am straight-up excited to see you continue this, Pandaman (Could've sworn there's a mechanic for "Mentioning" users on this site, is that a thing? How?).
That said...
I can't stand it when characters break the fourth wall. Nothing takes me out of it harder than someone or something in the game reminding you that you're playing a game. Seriously, every time a character says "This is like out of a VN..." I just gag, god damn. I mean, there are exceptions, for example the way Love of Magic does its ads for other games, but by and large it's just never a good idea to me.
Sorry, that was a bit of a tangent. In this case, I'm not a huge fan of how the alien/spirit/Merlin/Admin speaks directly to the player, I would rather have it musing to itself about these things rather than soapbox to you. And I would really prefer it didn't comment on the UI bugging out. Or the UI later being sarcastic about the nature of the entity. I mean, these things have a place, but generally I think it's more in comedy, or an attempt at something freaky, like in Metal Gear Solid 2, for example.
And one minor gripe was that while your character's jokes were actually pretty funny (I actually guffawed at '... The Elder!'), Maria occasionally make a quip and it's... It's just never funny. Don't get me wrong, not everyone is a comedian, and you don't need to be funny to have a laugh together, but within the context of a VN it just felt like she's just a cardboard cut-out to make you feel good. Only in those moments, mind you, otherwise everything felt very believable with her.
But it bears repeating, I really enjoyed this and wish you the best, Pandaman.