Okay so bleeding is pretty simple to explain, it gets reduced by damage reduction (which it shouldn't) and it seemingly doesnt count as a damage type for immunities. There are creatures, like constructs or undead, that get "IMMUNE: bleeding" and I also tried "IMMUNE: bleed" yet they still take the damage. Exeption here are Incorporeal creatures cause they ignore physical damage but then again bleeding isnt a physical damage type.
Second one would be Incorporeal creatures in general: So if you just regard the normal 8 damage types (Kinetic: Bludgeoning, Piercing and Slashing, Energy: Acid, Cold, Electrictiy, Fire and Sonic) it works just as intended. Kinetic is ignored completely and Energy just gets halfed. Now there are other damage types in the game obviously, for example there is force damage, which deals full damage to incorporeal creatures (that works as well) or maybe the alignment damage good, evil, lawful and chaotic. Which are just there to overcome damage reduction or resistance of certain creatures but for example a weapon that deals "piercing, good" damage deals half the damage to an incorporeal creature. Same for adamantine, cold iron, and silver. Magic damage is interesting as well. Now there are different weapon fusions in the game, all of which would add the magic damage type to your weapon since it says in the CRB: "Weapons with fusions are considered magic for the purpose of overcoming damage reduction." but only really one of them allows you to also deal that damage to incorporeal creaures namely the "ghost killer" fusion. In FG weapons with the magic damage type (for example fire, magic or piercing, magic to cover kinetic and energy) all deal about 3/4 of the damage to incorporeal creatures. To fix the ghost killer weapon I'm giving the weapons force and magic as damage type so they work like intended. But I can't give a weapon the magic damage type cause it has some fusion and still stop it from dealing damage to incorporeal creatues. Also the 3/4 damage is just so wierd to me, where does that ratio even come from...
EDIT: Oh and I did some more testing... Incorporeal creatures shouldn't be affected by critical hits, so they would take normal damage. And If I were to use other damage types that the system recognises (like positive and negative damage) that also doesnt work but I didn't expect it to be, since Starfinder doesn't have these.
Sorry for the long text :square: