This game is really good.
It's a simple turn-based RPG with lots of awesome characters.
The combat is simple and easy to understand: you can add up to 4 characters in your team, each of them has a role, a basic attack, a skill and an ultimate.
Every character can be equipped with a light cone, a special equipment which gives a stat boost and some additional effects, and 6 relics (a fancy name for the farmed equipment)
Unfortunately, being also a gacha game, there is the shit mechanic of farming an overwhelming quantity of premium currency (the crystals in this case) to get a single 5 star character or light cone (up to 14400)
On the other hand, this game is really generous with crystals and summon. you can receive like 100 pulls for free at the start of the game, many 4 star characters for free.
Other than the combat there are many worlds (for now 3) that can be explored. Keep in mind, exploration is worth the time.
There's even a roguelite mode (the simulated universe) where you can earn many prizes if you do it every week.
The story is interesting and it is linked to the "Honkai impact 3rd" story (recommended game). It's far from the shit we have seen from "Genshin impact"
Overall this is a fun experience if you like the turn-based RPG gameplay and the exploration. The story can be engaging too, just don't mind the limited events story (we all know that they're shit in every game)