This mod adds:
HP restore per one gold pickup.

You can change the HP restore value on this file:
Steam/steamapps/common/Noita/mods/Life when Goldpickup/data/scripts/items/gold_pickup.lua

local HealthAmount = 0.04   ( How much health is generated at pickup, 0.04 is about one health point. )

Install:
Steam/steamapps/common/Noita/mods/Life when Goldpickup...
GOG Galaxy/Games/Noita/mods/Life when Goldpickup...

If you are having trouble, test whether re-enabling the mod or reinstalling Noita will help.