Monsters don't kill me for some reason

Hi Everyone I am using the platformer module and following the video tut. But I can't figure out why my monsters are not killing me.
They just push me for some reason I took a short video of what's happening. I can jump on the monsters and can kill them.
https://drive.google.com/open?id=1pnUmBM5JfeLBrfYXh9AjHGKfAIDlCRYh

Have you set the Player's health? (if "0" your player will never die).

Well I guess I missed adding life to the player in the video that for sure was what the problem was thanks.