I enjoy this game so much,
I made a little mod that allows you to upgrade infinite weapon upgrade branches in bulk.
It's my first mod and my coding skills are pretty basic, but i think i managed to do a decent job. The calculations are being made outside of renpy "layers", which makes them very fast, definitely hundreds times faster than autoclicker.
Game version 1.0.2, probably not gonna be compatible with future versions if there will be any.
I didn't fix any bugs by the dev I found along the way, like some locked upgrades are available for buying anyways, scrambled ingot discounts, etc., but when you're at the point where you make billions of resources in one dungeon run it doesn't really make much of a difference, and that's pretty much where this mod is useful.
Installation is the usual, from the archive, just drop the "mod" folder inside the "game" folder and launch the game.
Inside the upgrade screen, choose newly appeared sub-branch with the upgrade material icon, then change the amount of material you wish to spend with the adjustable slider above the buy button and press Buy.
Please note, that even though the mod is relatively fast, when it comes to very large amount numbers like 11+ digits, weak systems still can experience freezes while calculating.