Heya narrowkaku!
I am replying to this thread informing you of your map's REJECTION!
Your PARKOUR is very repetitive, you could use more blocks such as brewing stands, heads, glass panes, water and slimes to add variety to your jumps! The length of your parkour map fits the medium difficulty, however the difficulty of your jumps is definitely easy so good work on that!
The BUILD itself is 3D pixel art, which is no longer accepted on ManaCube for parkour maps; when building a map try to create something that is full of depth and detail, larger builds are easy to do this on as well!
The THEME of your map is original, as there aren't any maps revolving around diamonds on ManaCube parkour, so great job on that!