Suggestion to improve visibility in the environment:

When a player enters a room, assign him/her a color. There are five players allowed in each room, so maybe the first player gets RED, the second gets ORANGE, third YELLOW, fourth GREEN, fifth BLUE. Show a dot or square of the color assigned beside the person's info in the upper left hand corner (that shows their name, health, and mana). Then instead of showing their name above their characters head, show a colored dot. This would allow other players to see much more of the environment and help players identify other players more easily when there is lots of on screen action.