Alright, I've judged all the songs you posted and some. Haven't listened to the others yet, but those are harder to judge since there are no direct comparisons... anyway, they're good enough that I feel a simple praise or insult is unjustified. I have to go deeper and here goes.
In general, they suffer from the common weakness of fanarts i.e. trying to 'recreate' the original and ending up being overshadowed by it. You can really feel it in those songs, that their arrangement is too similar to the original songs. Given how hymmnos downloads work, I don't think this is favorable to them... since Infel and Cloche are so different from each other, one being cynical as fuck (oh the bane of intelligence) while Cloche... well, you know. (I'm talking about the fake Cloche btw. The real Cloche is lovely <333) and similarly, Nenesha is not Luca. It is quite difficult on this side though, as we've seen very little of Nenesha to get a feel of her personality to guess what would she make of the feelings she downloads... but yeah. Not the best of decisions, but at the same time a very difficult problem. Given what they had to work with, I still say the songs were all very well done.
Also, the music tend to lack gravitas in place. An understandable shortcoming, they didn't have as much tools after all.
METHOD_METAFALICA/. This definitely feels more Infel-like than Cloche's, but it's still a little too starry for it to be Infel's. Especially when we consider it was this very song that led to her failing to create Metafalica in the first place... I think it would be much better if it sounds darker. Sure, the composers would like to assume the ideal case of them succeeding, but even so, I think knowing Infel, even as she bares her heart to all, it needs to sound a little snarky.
EXEC_METAFALICA/. Hoo. This is difficult. First, the issue with Nenesha being basically unknown. Secondly, the lack of lyrics from which this could be judged. But in any case, since this song is a story of despair, I think it sounds a little too unrealistic. I don't know Nenesha but I do know EXEC_METAFALICA/. in itself is a tale doomed to fail. Therefore I find this 'interpretation' of the story a bit queer.
EXEC_CHRONICLE_KEY/. Oh this is the worst offender. No, I'm not saying this song is bad, by all means it's a very high quality song. It sounds very lovely. But that's only because it's too similar to the original and that original is such a stellar song! I dunno who is Lyune beyond some historical mentions, but she isn't Misha so... yeah. No lyrics, can't judge that.
EXEC.with.METHOD_METAFALICA/. I fucking love this. Especially the beginning, it might just be better than the original. That said, it isn't without fault. The lyrics, in both sounds and meaning, seem to mix in less harmoniously with the music than the original, although again, they suffer from the problem of trying to follow its layout. Starting from 'sheak' the harmony drops substantially, making it not as pleasant to listen to. It picks itself up later on but it already lost too much momentum by this point to give off the same lovely sense it had before. Also, damn it this song is so lesbian. Metafalica is for everyone smh, why are you so focused on each other at the end? Sure, it makes them different from Luca/Cloche version, but this execution is too not subtle that it deteriorates instead of enhances.
edit: found out that some do post lyrics. will update my judgment later when I'm not lazy.