This mod is very simple,it add some hurt effect about player.
It add player hurt sound, you can put ogg file in config/modid/xxx/ folder, then you have your custom hurt sound. open your inventory screen, you can see a s button, click that button, youkan open sound selection, your just added sound is here.
It add some damage numbers, when you hit one animal, there will be floating damage number on the screen.
It add some visual effect, when you hurt by an enemy, your screen will turn red and glowing.