Upgrading the factory to V is on the list of upcoming content.
And demonic cultivator content should also be coming in the future.
Glad you're enjoying it!
On the recipes:
Goldsand is used by an upcoming Pillar Creation recipe, so you can't get that yet.
Deep Copper is an event-only recipe, I'll remove it from the list.
The rest are unlocked by researching items from the mine (1x Yinying Globule and 2x Shadow Core).
So you're just missing those 3
I do see your frustration, I certainly didn't plan around people playing 100's of hours!
I'll see what I can do to add a renewable source of lifespan. My main concern is if its too easy to get, then logically the world of the game would be full of immortal characters, which wouldn't make much sense. So got to figure out something that makes it work within the lore.
On the topic of lifespan, currently the highest age player (from my analytics) is less than 1/5 of their available lifespan (and they've spent a very long time grinding on some challenges). As a result, I don't think it's an issue beyond the perception of it going down. The time it would take to actually run out of lifespan is so long in real life I doubt anyone will hit it without actively trying to.
You can make multiple characters, just click new game and then when you click continue in the future it'll so all your created ones.
As for fist specific help, come onto the discord. There's always people willing to help with stances. Barrier can get stacked really high when you start combining various multipliers, like buffs to power, fist boost, and crit. In fact late qi condensation you should be able to max out your barrier each round. Again, how to get there requires all sorts of optimisations. Ripple Fist is also a very strong buff, hence it doesn't have a huge amount of techniques that can build it. But you can get it on masteries, which can help with stacking it fast.
The main increase in power for the player is good stances, so if you are finding things tough then optimise that. Also look into good masteries and good gear. And finally, the game is balanced around using pills, so not doing so is nerfing yourself.
Also, most cultivators you can fight are the strongest of the realm, not standard weak enemies, so they should be a challenge.
I'm glad you've enjoyed!
On the topic of buffs, it is a tricky one. There is a very wide variety between ones that stack, ones that are permanent, ones that stack in duration, etc etc. Currently, the only things that stack in intensity are ones that say 'per stack' after the stat. I know that isn't super obvious on the ones that don't do that (as it doesn't say anything like 'not per stack'), but it's hard to find a place in the UI for such a message.
I will look into ways to make this clearer however. Cant say when I will have a solution though.
Did you maybe restart the game during the tutorial? Something like this was reported by someone on the discord after doing that.
If so, you will have to make a new character, and play through the whole tutorial before closing the game (about 15mins).
If it happened without you closing, do say and try to detail the steps you did so I can try to replicate it.