Alright, so, it was a kind of Darkest Dungeon‑style game where you have to beat it and replay it several times, 16‑bit graphics if I’m not mistaken, very colorful, and it had that Auto Chess‑style mechanic where you combine identical pieces to level them up. There were pieces like Golem, Sailor (a pirate who used an anchor), Fairy (a fairy that shot lightning).
When you cleared a stage, at the moment of choosing the next one, there was a map full of diamonds connected by a line up to the final boss, where you had an X amount of advances to reach the final boss or you’d lose.
The early enemies were always bats, wolves, or goblin archers.
Basically an autobattler.
The final boss was a bunch of dragon necks coming out of the ground, one of each element.
The game must be from 2018 onward, it hasn’t been that long since I played it.
see if it’s Tactics: Summoner’s Arena or Mage Arena