I find difficult to give proper feedback on your game since I know that you are more focused on the multiplayer, on the other hand I was feeling overwhelmed by the many options that your game has, I usually like when games like this start with almost nothing and you build up your arsenal and skills by beating levels or buying on the shop, it would be helpful to have a pop up that explain what have you unlocked.
Gameplay wise I can't say anything since is one of the most polished entry.