PunchingDonut First of all, your game is very enjoyable. I've played it full and I'm sure I'll will repeat. I'm also thinking seriously about buying it on Steam to reward your effort. I've to say it's a fine example of how to do a platform adventure game.
If you allow me, I would like to comment some easy enhancements I think would benefit your game:
1. Stage transitions are confusing, specially the ones that are done in the middle of another stage through a door. Some times you appear at left and others at right. This is specially confusing after wining the fight to the angel and going to the cathedral, where the door you're supposed to go seems to be the one you come from. Maybe adding an arrow with "back" or something like this can help to know how where to move.
2. I haven't found recipes to add to the ones known. I don't know if someone teaches them or if it's trial/error. Maybe discovering some book of having some NPC's teach them can be a solution. Also a book item adding those can be another way.
3. When choosing difficulty, it could be good to know the difference between them. For example, Easy means less energy for enemies and infinite beer. Hard, enemies x1.5 health and damage, hardcore, x2 health and damage but more armors...
4. For completionists, a way to know where to search for runes, objects, enhancements... maybe when entering a stage a message can appear on a corner showing if there's something/what to discover, or seeing that on the map.
5. Lore needs a little polishing to make eldritch horrors, christian god and Norse gods to coexist. Nothing too fancy, but some line like Odin saying "our time has passed and christian god has replaced us, so I can help us to arrive Hel but not fight her". And other lines like "eldritch gods are eternal, not like your pathetic local gods". Also, "lore" section maybe can be renamed "bestiarium" and add the image of the character it's speaking of.
6. I've found a continuity problem: For example, You can recruit a nun that it's being raped by trolls and she tells you that Magda is being held in the steel foundry but in truth, she is still held by the bishop.
7. Some information about what statistics does. For example "charisma" allows you to fuck more opponents? What is the difference between "toughness" and "defense"?
8. Beware about comparing equipment. If something is equipped and you move over a similar object, sometimes the equipped object shows statistics that are not the same as if you go over the equipped object.
9. I know you've said you're working on "New Game +", but remember to add some description on what it means.
Best wishes on your game!