I listened to all the songs, and I have to say that this is a pretty good NS.
Do we know the format btw?
My top 14:1.
Varry Brava - "Raffaella"
An absolute fun song. There's nothing else that needs to be added
2.
Marta Sango - "Sigues en mi mente"
A good pop song. It's not even that special, but just absolutely catering to my liking of the 80s and 70s.
3.
Blanca Paloma - "Secreto de agua"
All the long notes are making it probably challenging to sing. If Blanca can hold them then good for her. As for myself there are a bit too many of them because in such an amount it makes the song just lengthy af.
4.
Tanxugueiras - "Terra"
First of all, yes this is a very unique entry and not what we're used to from Spain. What bothers me, however, is the singing style (sorry if that's something traditional and I'm offending it.) that unfortunately appears to be mainly annoying to me ... :/
Hopefully I'll get over this because I love both 
Tulia and 
Kateryna's vocal performances. Anyway one thing that I'm actually surprised about here is that the Website said it'd be the first Spanish entry in another language than Spanish or English, were the girls to win.
5.
Azúcar Moreno - "Postuero"
Good and modern pop song that I personally find way too long ... In fact I was on the verge of breaking up after like 1:40 minutes ... Apart from that there's nothing to complain about here.
6.
Xeinn - "Eco"
A synth-pop song (almost) like the ones we hear on the radio every day.
I may love that genre a lot, but what bothers me a lot is that Eco seems to be quite repetitive.
7.
Rayden - "Calle de la llorería"
At first it didn't really get me. But then it turned out to be pretty good and I quite like his voice.
8.
Unique - "Mejores"
It's starting off okay and also manages to stay at that level. There are however 3 things that I'm having my struggles with:
a) Why does the song keep getting louder at some point ...? The first time I got there I found it actually scary haha.
b) During the last minute I heard some other sounds (Computer?) in the back. They were a mess.
c) The song ends way too abrupt.
9.
Gonzalo Hermida - "Quién lo diría"
When the website called this a "beautiful romantic ballad" (or something like that), I got excited since that means it's not 100 % faster songs competing. It also turned out to be a very beautiful, but also boring song.
10.
Javiera Mena - "Culpa"
The song itself isn't bad, but I find it somewhat strange ... After some other people's reactions on Discord I had hopes for it to become an actual hit, but it just didn't ... Also was that organ in the background needed?
11.
Rigoberta Bandini - "Ay mamá"
Idk, but this is just not for me. I like the last like 40 seconds of the entry, however.
12.
Luna Ki - "Voy a morir"
Here I had a similar reaction to the one I had for Gonzalo after the song description. But boy did I get disappointed here ... I mean the song itself isn't bad, but it's just that her voice doesn't fit at all.
13.
Chanel - "Slo Mo"
A regular pop song where I probably shouldn't see anything that bad in. And yes the only negative thing I've got to say here is that there was something in it that annoyed me so much ...
14.
Sara Deop - "Make You Say
This entry is very 08/15 to me. It also vocally didn't convince me at all.
All in all I can say that I like 7 songs (that I also voted for in the poll) and don't mind 2 more. However I'm trying to like more of the songs hence all 14 (respectively 13) are now in my Spotify playlist.
?
Do we know the format btw?
I may love that genre a lot, but what bothers me a lot is that Eco seems to be quite repetitive.