Hello absolutely1,
Unfortunately I will be Rejecting your map.
The theme is original, there is another map with a similar theme (MineVast - Hard) but none directly of ManaCube.
The build isn't very good. I understand that you were going for a cube, but it is quite plain and unattractive.
The parkour is quite repetitive. You used a lot of single blocks and ladders, you did use them creatively in some sections though which is good. I would recommend experimenting with a larger variety of blocks and items when you build jumps, it makes the map overall more enjoyable to complete.
A lot of the jumps were floating, please try to avoid having a lot of floating jumps in your maps, as this makes the map overall look quite messy.
The length and difficulty are good for a medium map.
Thanks for submitting your map! I hope to see more maps from you in the future.