Hi there aryleaa,
Im sorry to tell ya your map has been rejected.
The THEME is original, so good on you for that ! The pandora's box hasn't been used yet.
The BUILD is lacking in detail and is leaning on the side of 3D pixel art. Try to add more detailing and shape the box possibly in a different way like the box being open with things inside !
The PARKOUR fits the length of a hard map, but is very inconsistent in difficulty. Some jumps are harder than others and then the rest of the jumps don't fit the hard difficulty. Your variation was well done though ! Make sure you're also in 1.8.9 as some jumps are impossible if made in 1.16 !
Thank you for the submission, I hope to see more from you. Have a wonderful day !
-Ana