This is def my biggest issue with the game, I feel like there's no freedom to roleplay or make any choices, you practically HAVE to play with the walkthrough open.
At that point, why even make dialogue choices? Just straight up ask the player, do you want to be on this girl's route, Y/N?
I'm still salty that choosing to not ask Luna about her gloves after the first eternum play session locks you out of her path forever. Like, fuck me for not bringing up something that clearly makes her uncomfortable out of absolutely nowhere?
I don't use a walkthrough and don't have any trouble. I used a walkthrough after the fact for the dev's previous game just to see what different possible endings there were, and I think I checked to see what the best choices were from the alchemist or something since that wasn't an immediate response.
I'm not trying to brag or anything, I'm just saying the game isn't designed to be *hard,* you just have to know what game you're playing. So often, you are very clearly given multiple choice options where one of these is going to be the right one and picking the others will miss out on relationship points or even close a route. There are plenty of games written in that style of "guess the right answer" and playing around with that and making it fun is often part of the game -- indeed, it's the only real gameplay a storyline game/visual novel might have. Sometimes it's funny (there's at least one popular AVN here which makes searching for the *wrong* answer to get comical game overs a big part of the fun), sometimes it's serious, sometimes it's obvious, sometimes it intentionally isn't and the right answer was complimenting someone's pen (a satirical nod to the nature of the gameplay), sometimes waiting for the payoff (this was clearly the right thing to buy in the shop but why?) is the point, but if you think about it like that it's easy almost all the time to see when there's going to be a right answer and how to find it. The feedback system from the beating hearts and the quicksave/rollback feature is your friend. You're supposed to fiddle. It's not really mean to be played as a roleplay where you pick best girl and get substantially different playthroughs if you focus on different LIs (there are games like that aroudn here), it's a collect-em-all where there's an intended best path and little mistakes are OK but too many or big ones will cut content for worse alternatives.
When you've got options, try each and rollback. If one of them had beating hearts or extra dialogue or what have you, you got it right, probably. If you want the full content in one playthrough, make sure you get most of them right. The game will let you make wrong choices so that it's a game and not totally kinetic, but it almost always gives you the feedback you need more or less immediately.