Ok, after playing for a week or so, I started enjoying the game more and more...still, there is a lot of grinding and P2W but you can still enjoy the game as a freebie.
My discontent was with the gacha rates but it was probably a bad luck streak, as of now I'm 7 character away from completing the roster...still...it was an horrible bad luck streak with more than 12 basic scrolls + 4 mid scrolls (hitting the 2x value) to get my first "new" character.
The gameplay is similar to autochess but a limited roster of characters and altars to play with different strategies, don't think about being competitive since the game isn't that new and forgiving for "late comers", the grind will be insane but if you don't mind playing once in a while using the "extra stamina consume" option you'll be fine.
Characters looks a lot like a game I used to play as a kid, Ragnarok Online, so that was a big plus on my graphics score, other than that it is pretty simple with no flashy effects.