My only word for this game is addictive. The more you play it, the more addicted you get.
Simply put, it's like Auto Chess, but slightly different. The preparation phase is where you pick your pets and their positions, buy or roll pets to build a stronger team or level up by merging pets of the same one. Mechanics like that are quite auto chess, except the battle is your pets vs enemy pets, hit one by one, until one wins.
So, I haven't won a game after playing for so long. Many times I thought my combo chain was strong enough, but I didn't expect the opponent to be stronger than me. Like the feint combo, the AOE damage is really badass, and using the summoner combo is easy and powerful for beginners (I saw a 50/50 enemy pet by summoning massive pets).
After a few games, I found out that to win the game, like auto chess, you need to learn about the pet combinations, and how they stand against each other. The lucky draw will determine a lot, but you'll need to build your team based on the shop you've been given.
Btw the game is not just for mobile, it’s also available on PC and your browser.