If you don't like deck builders, then this game is for you. It does everything that a deck builder shouldn't do. Here's some examples:
1. It doesn't allow you to skip cards that don't fit your deck.
2. It punishes you for trying to create synergies. You want to give yourself some buffs or debuff your enemies? Too bad, every character can only one status effect on any time.
3. In case your thought the previous point was bad enough, bosses start with a buff that prevents any debuffs for multiple turns,
4. It limits the number of relics you can have at a time. Luckily, you can skip bad relics, so the developers do have the technology to make skipping cards possible,
5. Other than that, bosses are terribly designed. How do you like receiving unpreventable piercing damage every turn? Or how about trying to avoid a hit that would one shot you?
6. It relies heavily on RNG. You will encounter moments, than no matter what you've done to prepare for the boss, you just have to pray to get lucky.
Didn't play the game for too long, but also seems like it would be very grindy to unlock all the characters and areas in the game.
To sum it up, it's not even a nice looking game, it just looks and plays like a bad mobile game.