Updated for 1.21.3. With the Sniffer turned into a Reaverbot, all the blocks and items are finally done.
Textures for Bundles and the Pale Garden biome added, along with some new wolves and various other mobs. The Warden is now a Fallen King and the Ravager is now a Sydecka. All the paintings are done. Players now properly ice over when freezing to death. I'm always tinkering with blocks, so redstone power levels, deepslate tiles, and cobbled deepslate now look better. Sounds for portals and pigmen have been made less annoying, while sounds have been added for the stonecutter and the Warden searching for and locking on to you. And you will LOVE the new potion drinking sound. You'll feel refreshed!
IT'S ALIVE!
It took seven years and it's still not done yet, but I finally got this pack to a close enough completion state where I'm ready to re-release it to the world. My bare minimum criteria was all the blocks and items being finished and as much extra functionality added as I could, so you have a good reason to download it even if you don't care about Mega Man at all.
At this point I just don't enjoy Minecraft as much without my own resource pack adding a lot of life and color to it, so I practically needed to finish it again.