Oh wow, this is really cool! I especially like the work you've done for some CC-specific blocks, like the Crate or Magma, they feel like they've been part of original Minecraft since the beginning.
The font is especially really neat, although it's probably not much to write home about as there's many pre-existing "HD Minecraft Font" resource packs out there right now.
While these textures were probably partially lifted from pre-existing faithful packs, i do have one suggestion for the grass texture, as it feels darker, have you considered putting more highlights on it? I think that if you did that, it would feel closer to an HD version of the original grass texture, as it would feel less "dark".
Another gripe that i have, that isn't necessarily an "accuracy" issue and moreso a "look" issue would be how the bricks have very little depth to the individual bricks, they feel very flat.
(also the yellow and red flowers are swapped.)