Be warned, though the game advertises itself as having controller support, and it's even an option in the settings,
the controllers do not work. It's apparently some kind of issue that a lot of people are dealing with, so it's not you. It's an error.
Moving on, I am not really gonna comment on the story becuase it's basicually just technobabble ZZZ but through the inernet and with little intrique and no siblings though I find it fucking funny that the good guys organisation in this universe as provided by a gacha game is called EOS.
Moving, the system takes a lot getting used to, at least for me. It's not at all like Star Rail despite being turn-based. TAKE NOTES, REMEMENTO. In comparison, it's also far better optimized and way less glitchy and the models don't look like ass and the music is pretty decent.
To start a battle, you actually have to hide for a second, then do a sneak attack. And you get to choose your party for every battle. Neat.

To my understanding, not that the game explains it too well imo, the skill cooldown is based on turns as opposed to energy like in HSR.
Also, we're back to the element system.

We also get our own cutesy mascot, but it's thankfully not too annoying. Idk what is with gacha and adding some cutesy fuck to ruin the mood when we're investigatingg some rich guy comitting crimes against nature to revive his dead daughter but I digress.

I have yet to unlock the PVP, so I can't comment on that.
Anyway, it's not an open world. Not even an overworld. Combat is a stage-by-stage process, sort of like ZZZ. Your MC is not a player character in battles either.
Your MC has as much presence as a wet tissue. You select a gender (you cannot change this), slap a name on that ass and that's it. MC doesn't even have a voice or exhibit any sort of expressed personality or goal aside from "saving the day from the corruption of Ether-I mean Genesis". You have no backstory and you're certainly not special. You're just a joe-schmoe using your techno powers to move shit along while the actual characters continue the plot.
Even the replies to the other characters are bland as fuck.
The reason why it didn't work in Rememento was because that game wanted to make the MC into something special. Here, we are certainly not some special chosen one, so our blandness works.
MC mainly just goes through the stages, hiding to ambush enemies, and opening chests.
One con, though, is that it can be really barebones of content, since unlockables are hidden behind your uhhh character level. Your adventure rank, if you will so you gotta grind some stuff to reach a certain threshold before you can continue. This extends to story content. The power scaling goes from 1 to 100 pretty quickly, and it takes a while before you unlock EXP farming and gear/artifact/relic farming.
And even then, you're basically stuck between three sets that might be utterly useless to your character. So you gotta half-ass building characters.
There's very little to do, in short.