A solid and meloncholic adventure that is framed as a simple job, only to uncover a tragic and personal story, reminiscing stories such as Signalis.
+ Well thought out NPCs and their impact with the timeline
+ Simple yet effective monster design with easy to understand mechanics
+ Overall refreshing backstory to the events of the disaster that isn't just due to the existence of a monster
As you've expressed interest in receiving feedback, here are my main points of interest.
Although the backstory of the adventure is fleshed out, the overall present game feels to lack any tension because the monster is being subdued by Ophelia. It even seems you can complete the job without ever encountering the monster or Ophelia, though I might be wrong in this aspect. Another aspect to this is it feels difficult to know what to do with Ophelia outside of finding her, even making her confusing as to why she'd stop playing the piano they is subdueing the monster. It says she seeks revenge, but it seems vague as to what that revenge is. It seems like she already got her revenge by killing the doctor.
I think the present game could benefit from reframing the job to also destroy the "bioweapon" in the facility, giving OP tools to do so but not explaining its true nature. Then have the monster be an ambush predator that roams around, all while Ophelia is doing what she can to hide the monster/ their bond from being hunted. This can give a lot of danger for the players to experience while leaving a moral dilemma to deal with, which makes Ophelia's current role all the more clear and make learning about her backstory that much more impactful. Plus, if the players refuse to side with her, now Ophelia's revenge becomes clear as her hand is forced to turn on the players.
A minor point with the visuals is that, although it looks very sleek, it is losing contrast and readibilty with anything that's in grey, like the vent ducts and highlighted descriptions. A very minor nitpick, it'd be nice if the pamphlet is a seperate download from the supplementary material, as it's a surprisingly heavy file to download in order to just check the pamphlet.
Overall, I think this has a lot of great potential to serve as a tragic story for players to learn and experience, rather than the common setup of surviving against a monster. But there currently needs more involvement with the monster to give a sense of danger and split the party between being merciful or not.