I thought this looked cool so I gave it a look.

• Personally not a fan of the entire boundary being accessible to players. Maybe prevent people from being able to jump up on 2 of the 4 sides.
• I don't like the pelican and the van in this map. They look completely out of place.
• You need to add more respawn points. WAAAAY more respawn points. And more initial spawns as well for the sake of those who want to play the map with more than 8 players. I suggest you look at existing and successful grifball maps for an idea on how it's done.
  
• You got the middle wrong.
  

The map has potential though. I hope you update it