In this post, you see an image that says UI. That will be the User Interface used when playing the game online or locally with other people. You can see your health, how much ink you have remaining, which team is in the lead, and time left for the match. This will allow players to know when they are about to die, when they need more ink, where enemies are coming from, how much time they have left to fight for their color to help them react a certain way, which color is in the lead which can impact the player on which player/team they should attack.