for the characters achetype, it's the whole point of an archetype, it's a blueprint where you add your own spice, so yeah marrow is similar to ranok, just as much as amicus or any other furry VN with a very himbo-ish love interest. I feel like the comparition of murrdock and vulgor is far fetch but I haven't read enough of FBTW so I guess you're right is a way but you also can compare him to other's vn's "rude but nice when you get to know them".
now for the ''psychological issues due to being transported'' in FBTW, The MC has no memories while tucker doesn't have any problem I think ? Unless I miss something ? But if you were talking about the whole big sad and anxiety attack. It's just natural reactions to such drastic situation. It's actually a sign of effort from the autor to give their characters some personnality.
And for the whole prison thing, it's a furry isekai, it's part of the theme you can't just pop in a new world full of new species and walk around like nothing happend this is a necessary step for the reader to gather information of this new place while giving any kind of purpose to the story or a goal for the MC or just simply a realistic integration of the brand new human in this beast man world.
So yeah the game is an isekai and it's following the rules so far which is ok i guess ? I would've personnaly said that there was hint of inspiration from adatra (a tiny bit) more than FBTW but at the same time it's also an isekai so you can probably note the same similarities to other vn.
PS: I also have to add that it's weird to compare it to FBTW specifically since the first few hours of reading is just adatra in a different universe imo. ( Not to spit on FBTW I didn't liked it but it's a great game for a specific public )