Atelier Firis is the first open world (kinda) Atelier game in the series. It's not true open world in the sense that it's one giant world and you can traverse it without any loading screens. Instead it houses extremely large areas that are connected to each other, that's closer to the style of the other Atelier games. Despite this, it's not a bad attempt at going more open world than the small linear hallways that we're used to from the series. The main issue that this game has with this switch is that they do not give you the ability to travel faster for a good portion of the game and then warping between areas campsites comes not long after that, depending on how you go about the game post-exam. Gating the faster travel behind the second part of the game was a very bad design choice.
The story is also one of the worse entries in the series. Not so much for the story itself, but for how broken up it is which causes some very bad pacing. You can go very long periods without advancing the story, which when you're advancing across a large map to a destination point for the first section of the game, it causes some disconnect as to what you're running around for. Even after the exam, while better, it still has pacing issues with the story and I felt very little reason to continue playing. There was very little attachment towards the remaining story and I felt there was no real goal for me to continue towards.
Characters are still decent, but they're mostly a step down from past entries. Like the story, there is a lot of pacing issues with characters stories advancing with your own. A couple characters I'd somewhat classify as fine, but the rest were just pretty bad at keeping my attention because I would rarely encounter events with them. Hell, some I haven't ever had an event with after I initially recruited them.
Now the gameplay I'll split into two sections with the first being battle. Unfortunately I can't really say too much on this because its been too long since I've played. It is very similar to Atelier Sophie in a lot of ways, however one thing that I do remember well is that you can no longer defend any ally who is being attacked to help distribute and mitigate damage received. Instead you are only able to defend Firis. The game doesn't end with Firis faceplants the ground, so I'm not really sure why they limited it to just her. It's not a huge deal, but an odd one.
The second bit of gameplay is alchemy. It still uses the grid system from Atelier Sophie. However instead of the grid being tied to couldrons like they were in Sophie, they are now instead tied to catalysts that you can select after selecting all of the recipe ingredients. Each catalyst you can use has different pros and cons that differ from item to item. I liked it more than Atelier Sophie and made me less distasteful against the grid system.
Despite this there are two things they added to alchemy that I absolutely abhor. The first one being that in order to get better bonuses when crafting an item, you have to keep re-crafting it until you hit gold familiarity with it. Logically it makes sense, but from a gameplay perspective,

you GUST. The second one is how you acquire recipes. In Atelier Sophie you had a book that showed you recipes you could unlock and it gave you requirements to unlock the next items within the book. It was annoying, but at least you knew what you needed to do. In Firis on the other hand, you have to gather items to kill enemies until it becomes an "idea". From there you can see what else you have to do to unlock it. You might not think this is bad and for the first half of the game it wasn't an issue. After the exam though, I about flipped my shit trying to figure out how to unlock items. I think it's a good system to use to compliment something like the recipe book from Sophie or recipe books you could buy. This is probably the number one reason I stopped playing even though I have the ability to finish one of the endings done already.
Finally I guess I should briefly touch on the time limit in the first section of the game. I did not find it even remotely close to an issue. You are supposed to get 3 recommendations and proceed to an exam within a year. I was able to get all 5 recommendations and still have around 180 days remaining to futz around doing whatever I wanted prior to the exam. I was able to explore everything possible during my first 185 days, including high level areas. The only places I was not able to explore were ones gated by item/event requirements that weren't possible until the second section of the game.
So in conclusion, while I liked the larger maps it still needs further improvement. Plus there are several design ideas such as learning recipes that I have to seriously question who at GUST thought this was a good idea. Despite this I did still get some enjoyment out of it, but it was nowhere near the level of past Atelier games. I'd only recommend it on the cheap or potentially some kind of rental.