Hello FantasticMattJr,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are multiple maps about minecraft blocks/ore/mineshafts. Please check the document linked in this thread -
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map idea is original.
There isn't really a main build to this map, try to have one or two larger builds relevant to your theme, then incorporate the parkour into that, rather than mainly having jumps floating over the void, as this can make your map look quite messy.
The parkour is repetitive, as it's mainly regular blocks. Try to experiment with a larger variety of blocks and items, as well as how you utilise these, as this will make your map more enjoyable to complete.
The length and difficulty are good for an easy map.
Thanks for submitting your map! I hope to see more maps from you in the future.