You can summon a medical hologram to repair your health. BUG: You have to be away from auto turrets to use this.
Mods introducing new content into the game.
New ways to deal with enemies, be it attack or defense.
Basically a new monster{engineer ghost) that spawns and attacks you but give healing damage when you kill a wisps or cut down a tree. https://mods.factorio.com/mod/Will-o-the-Wisps_updated