Christmas Panic is a First Person Shooter in which your goal is to defend your elves during as many waves as you can against an army of impatient children. To do that, you can throw gifts to force them to leave the area. 

Be careful to not run out of gifts or you will not be able to push the children away. You can retrieve some gifts by interacting with different crates around the map or by looting the ones sometimes dropped by the children.
 
Your main goal is to take care of your four elves. They lose some of their health when they are hit by a child. You will lose if all of them are taken down.