Haha no, this is a small indie game! I have actually wondered whether Attack on Titan fans might potentially enjoy it - it's similar in that it's quite an unforgiving war story with a large cast, in a European-esque setting.
But past those broad strokes, I'd definitely give caveats before recommending it to anyone wanting something like AoT, because it's quite different! Because We're Here is a romance (it's an otome dating sim), and it's based on World War One in particular. It's mainly about daily life in the war for low-ranking soldiers on both sides of the conflict - the tone is very low-key and conversational, and the fighting is never really the main focus. And while it's a fictional setting, it's a very grounded depiction of WWI - as in, there are no fantasy/magical elements to the story or world.
So I don't think I could confidently say all AoT fans would enjoy BWH, but I think some of them definitely could find something to like here! ^^ I hope this helps~