The cleric ability Preserve life says the following:
Starting at 2nd level, you can use your Channel Divinity to heal the badly injured.
As an action, you present your holy Symbol and evoke Healing energy that can >restore a number of hit points equal to five times your cleric level.
Choose any creatures within 30 feet of you, and divide those hit points among them. This feature can restore a creature to no more than half of its hit point maximum. You can’t use this feature on an Undead or a construct.
I can't seem to find a straight definition of "creature." Can the cleric heal Player Characters, humanoid NPCs, etc? A layman definition of 'creature' to me would mean any non-humanoid / monstrous enemy to the characters. But it doesn't make much sense to be able to heal only your enemies.
So are the players considered creatures?