Probably categorized as a "play-to-win" game and incredibly addictive. It affected my sleep health to the point where I couldn't sleep. I never spent actual money on it, but the game constantly encourages you to keep playing. In order to obtain characters you don't have, you have to gamble in the gacha system and run the risk of getting a repeat. Additionally, you need to have quick reactions and good techniques. I found myself constantly waiting for lives to replenish, playing non-stop, and feeling my heart rate elevated to an uncomfortable level and it did something to my body to make me unable to sleep.