Trenly summed it up pretty well.
We don't really accept pixel art nowadays, no matter how cool it might seem to some people, it's unprofessional.
And the parkour itself (like the floating wool blocks) look bland. I understand it's just parkour, but look at sprint parkour or something. You can still add lots of detail to the parkour platforms.
The overall atmosphere doesn't live up to 'video games' as a title, either. Like
Trenly said, a retro arcade machine was sort of what I expected or something.
The map is unprofessional and doesn't match the standards the server holds these days.
Sorry, but your map has been declined.