I loved the aesthetic of Child of Light, and even the fact that dialogue is written in terrible rhymes, but its timer based turn-based elements system did not work well for me.
Basically, characters take turns based on time progression determined by their stats, and each action also takes a certain amount of time before they trigger, and can be interrupted if a character (or monster) is attacked before its action triggers.
However, the actual result of this is that battles later into the game become complete wipes, where either you or the opponent barely gets to do anything, since you or they are constantly being interrupted during the wind-up phase of actions, or they become long frustrating slogs to finally beat your opponent or get wiped. You can defend to avoid interrupts, which causes you to block one attack and then gives your next action a speed boost, but once you fight multiple enemies that both buff their own speed and debuff yours, then your followup action just gets interrupted anyway.
So if you play Child of Light, then I would strongly suggest playing on easy to avoid having to deal so much with the combat system.