*Spoiler Warning Ahead*
I just played this game recently with a friend on a whim and absolutely loved it. Starting from the beginning, the visual and audio elements of the game are wonderful. The art itself is very nice (both the character sprites and the backgrounds) and when combined with sound effects and music it gives this nice, undercurrent of dread that permeates the game even before shit truly hits the fan.
Now, as for characters, I like how there is a large range of behaviors in Haven. You have Eve, the overachiever who seems to revel in petty victories and paperwork. Grace, the fully indoctrinated follower who truly believes what she's doing is best. Cerise, the traditional bully archetype (although not so traditional in terms of art depiction. Gotta say, this is the first buff mean girl I've seen in fiction. The fact that she could both ostracize and also beat the shit out of you made her oddly memorable in terms of bully characters. Truly the worst of both worlds to deal with). Maria, the one who never lifts a finger but is fully aware and complicit in the system (and very fitting that her character death starts by her refusing to look at Magda - ignoring the problem until it goes away until her dying breath).
And of course, there's Nils and Magda.
Magda is very much your sweet girl-next-door trying hard to be good and probably would succeed had she been in any other setting. Alas, being in a cult, "good" is more of an obscure, ever-shifting goalpost designed to keep people in line than it actually relates to any actual sense of true morality, so of course she fails. She is a very easy character to like, and you do truly get attached to her and sympathize with what she goes through, which makes her breakdown and descent all the more compelling to witness.
As for Nils, I enjoyed them throughly. Even from the beginning, you immediately want to know more about them. If this were a play, they would have an amazing stage presence. I like the parallel between them both winding up in their current situations by feeling compelled to go beyond what they're "allowed" to (Nils by choosing to help out humanity despite multiple warnings against it, and Magda by her choosing to sneak out to satiate her own personal curiosity.) I also like the contrast of their personalities, the sugary-sweet (well, mostly) Magda with the bitter and caustic Nils. Watching them interact together is a little like if Carrie White had met Venom, and I mean that in the best possible way.
My only real complaint is that I wish we got to see more of them together. From what Nils said about this being their "last resort", I imagine they had a different plan in mind originally. It would have been nice to see more visits/more interactions together before their final merging.
But all together, it's a great game. You did a good job, especially for your first game! I would love to see what you make in the future.