​We don't need Hitstop in Space Marine 2 because this is not a Fighting Games nor Monster Hunter or Souls-like game this is a horde game where you fighting multiple enemies at a time.

If the devs don't really want to remove Hitstop here are my genuine suggestions:

1. Slightly reduce the Hitstop frames.
2.  Remove it in light attacks but keep it in heavy attacks with reduced frames.
3. Remove the Hitstop and make heavy attack slow the screen just like in the first game.
4. Or just erase the Hitstop entirely from the game.