It feels bad to be among the 3-4% of players who vote this game negatively, but this is what the personal review system is for, right?
I was playing the game because it got recommended me in the discovery queue at a point, and at a point I added it to my library; and because I am participating in an event where you're supposed to play the top rated games of your library - and Eternal Senia was in the top few unplayed ones with its 97% longterm review-rate. So I needed to finish it.

As a forerunner - the game is not bad. Has ups and downs, and a lot of lukewarm mish-mash …filler-quality stuff to it. Knowing what the game is I'd never have added it to my library. I wouldn't recommend it to my friends because it lacks a solid backbone to enjoy, it's more like a timesink. Maybe you have more time, different taste, or - very likely - different friends, you may like it.

So, about the game:
I liked the music. Despite being super short and looping, the menu theme is pretty cool. Again, sorry - but a tune this catchy would deserve a game with more content. Other music during the game were quite distinct (especially the ones played during boss fights) and the sound effects were pretty good as well. Combat sounds effects OK.

Graphics is a bit of mixed bag, feels better than standard RPG-Maker sprites, but nothing really outstanding. I don't know if the spell and lightning effects were original, but they were used pretty well for the most time. Environments were varied (3 different chapters) but really barren at many points, and there is just nothing much going on. It's an ARPG with 2-3 characters that you don't fight with, and it was made with RPG-Maker as the dev's first game project,

And for that, they did a pretty good job, with the tools they've got. The combat is a real YMMV thing - it's grindy but easy, so it's either laidback and chill (I felt this way) or repetitive and meaningless, as others felt. The item system was sadly pretty horrible, upgrading a worn item can require up to 30-40 button presses because it needs to be unequipped, then in a submenu of a submenu of a menu you need to scroll though a list of all possible recipes to upgrade it, then go back and re-equip it.

As I said, it feels weird to criticise someone's first attempt, but as the game is on Steam and in public, it can't get a universal pass. My main issue with the game is that it's - feels like admittedly, based on its description - a fanfiction-game of some characters from an MMO, and even ignoring the grammatical problems (It was painful to read "sis" a few hundred times, like a reminder if you'd ever forget who is the girl the protagonist nonstop talks about, despite never being present), it's a repetitive, cringey, anime-tropey story. There are barely any dialogue to be found, only monologues.
There are I guess multiple pages worth ramblings about " I relied on you, but I want to help, I'm independent, where are you" from a character who's avatar is constantly blushing and/or crying.
[spoiler] And in the true ending she does her best to convince her sister Magaleta - from not sacrificing herself - that she needs her because not mature or independent enough[/spoiler] I… feel like the dev wanted to make a damsel in distress waifu-character from the MMO the strong protagonist of the game, but also keeping her timid and mouse-like because that's the original character. I may be very wrong about this, but the representation and the personality that is "presented" is jarringly different.

So, all in all I am quite baffled how this game has 97% review rates, and in a way I feel super cheated by the premise of this game being that good. It's okay, but it's a far, far cry in quality from the 95+ % games that people actually paid for.
Looks like it being free really gives a lot to it review score, I think it's in league with other games that are in the "mixed" review category. If you're on verge, treat it like so.