Question About House Rules as a First Time Warden

Hey! I’m a long time GM, but planning my first MoSh game. My background is in narrative games, so I want the rules to be as streamlined as possible. I’d like to use the house rules below, but I’m not sure if it’ll make my game too deadly.

Lethality - Ignore Health, just use Wounds. All Weapons deal 1 or more Wounds.

Player Facing Rolls - Players make all rolls. In violent encounters, a failure to hit could mean the player character is hit instead.

If further context helps, my first session will have the PCs desperately escaping a very powerful alien invasion. I’ve run 5E and PbtA pretty thoroughly and player death is typically pretty rare in my games, but I know MoSh is a whole different ballgame