Well. Disappointing and confusing.

I will be speaking as someone who didn’t read the novel.

My biggest problem is the pacing/rhythm. Everything happens suddenly and seems to be randomly stacked and we viewers have to get through this.
Nothing happens in the first episodes except their meeting and the lake situation which is a way to introduce Lanak.
Speaking about him, his arc is the most confusing. It starts off very suddenly, literally in the first 5 minutes of an episode then Tinasha breaks Oscar’s curse and switch sides in the next 5 minutes.

Then they have their first kiss out of nowhere, Oscar get poisoned for no reason then we get the Leonora arc at the end.
About this, Lanak’s arc at the end would have made so much more sense, because it contains way more challenge and importance regarding the storyline. And at the end of the day, none of this has a real impact on the storyline except on Tinasha and Oscar's relationship that itself feels rushed, even though this is my favorite part of the anime.
Feels like a waste of time… most of the time.

Then this ending. I get its because of the ‘Unnamed Memory’ title but it was far from needed as it (in one single episode) :
1- made the whole anime even more confusing.
2- made everything that happened before totally useless, as it was very confusing already. As someone said in a discussion, 11 episodes throwed in the trash in the spawn of 20 minutes.
3- is overall an useless ending that I wished, would've never existed.
4- feels like what any bad writer would do at the end of their book to make some sort of plot twist : « and it was all a dream » like hello????
(not to mention he kissed a 13 years old girl but thats another discussion.)

I saw in others reviews that the anime adaptation was indeed a massacre as it didn't do the novel any justice. I also saw they were gonna do an act 2 but how???
This ending leaves us no way to project ourselves in any future.
For me, an ending is supposed to leave some room for the viewer’s imagination. But I dont see anything with this shady ending.

Finally all my comments above are probably so harsh because I had high expectations for this anime (which is this time, not it's fault).
There was so much potential but the potential got skimmed, rushed, smashed, dragged through the mud by ENGI.

conclusion :
EVERYTHING happens suddenly with no explanations and more importantly, half of the anime feels like a waste of time (50% bcuz of that ending), time that could’ve been used to deepen a lof of things.
And indeed, NOTHING is deepened in this anime even though this IS a deep anime.
Which makes everything more confusing.
I feel like the whole storyline was rushed and in order to have an impactful ending nevertheless they well… did this ending that makes the whole anime feels empty and useless, when there was so much potential, which was truly wasted. Loved the romance and visuals tho.