I don't want to perpetuate the argument of what is ntr and what is not so I'll ask my question this way. I have used the search and have gotten some confusing results on what goes on in this game. Some say there is ntr and some say there is not, while others say the girls have sex with others, other than the mc with people giving mixed results on this as well. I am not here to argue with anyone, but just want to be informed. So my questions are these do the girls have sex with others (including aliens) other than the MC? If this does occur is it a situation where it is avoidable, and if it is avoidable is it just that it happens offscreen and you don't see it, but still occurs or does it just not happen at all? Again just want to see if it something I would be comfortable playing. Any answers are appreciated.
Currently there is no cuck or NTR in the game....because there are also no relationships or romance in the game - the girls aren't even really waifus. So far the girls are basically just sluts that do anything. Also, all sex scenes are completely detached from the narrative outside of (3) Recruitment scenes, which really have little to no context for the scene, but are basically the only canonized 'scenes' in the game.
As far as monster stuff it is canonized with Lily as there are conversations that do happen that indicate she 'takes her work home with her' involving the mantics so to speak. There's also a specific conversation where she talks to the captain about having boned a couple dudes at the same time in a brothel or something in the past (the captain apparently remembers her from that location). Some people might consider these 'cuck' type things (and for the record I'm not into cuck or NTR stuff), but IMO they can't be defined as that because the game has open relationships, which again, for the record, I consider to be an error by the dev team with the way they designed this aspect of it.
It's worth pointing out that the game is on v0.1 which means a lot can change, so my advice to you would be 'test drive' the game yourself and give your feedback on the Steam forum and Subverse Subreddit on what you liked / disliked. While there are things I really liked about the game, I think the sex is terrible, not because the animations are bad, but because of the lack of context, and just the way they've handled romance / relationships in the game.
For me, coming out of checking the game out myself, I am not buying it right now as there's too much I don't like (all of those things are with the sex / romance parts of the game), but I thought the graphics were great, and I enjoyed the schmup missions as well as the story so far. I am basically in a holding pattern waiting to see what kinds of changes they make to the game moving forward and then I'll re-evaluate.