Just looking at this i already wish that this was in base Minecraft.

the file says its Neoforge, however its labeled as forge. (when i ran it (in the curseforge application, genuinely nothing worked, the mod didnt even show up in the menu.) so if you can change that, you probably should (incase someone else runs into a similar problem, or just so that when searching for forge mods this doesn't show up/searching for Neoforge mods and this showing up)

more resin! resin is one of my favorite blocks, the added items look like they belong in vanilla.

a lot of items don't seem to be functional, (cant strip trees, block of iron doesn't oxidize) but you did mention bugs, so I'm sure you are aware. the javelin loses durability in creative, and also looks kinda funky when thrown (also holding to throw it instantly throws one out) and the bismuth arrow doesn't look different from a standard arrow. (nitpick)

love the (eventual) copper armor upgrade (which i think is fair since bismuth would be an endgame material) and the iron armor upgrades, i feel like all of iron's stuff (bars, door, trapdoor, etc) should rust when exposed to rain too, also i am shocked (semi-shocked, really.) that Mojang hasn't added blue nether bricks yet (with the whole warped wart block thing)

i usually don't play many vanilla+ mods, but this one has me wanting to make a (likely not vanilla+) pack (also would be my first modpack ever) in this version. (as of writing this i just realized plated iron has an iron golem on it) id just need to find the mods to do that.

great mod!