HUDOverhaul offers a new experience :

• Adding sounds of shortness of breath, a heartbeat, and a blood-red visor.

• Natural regeneration that varies depending on your health
  ( low health = low regeneration / high health = high regeneration ).

• Furthermore, some elements of the vanilla HUD are hidden,
  such as the compass, inventory slots, character status,
  and the chat is compacted ( you can no longer send messages ).