There are so many confusing stuffs in this game.

First of all, health bar is so huge that I can't even tell who is being targetted when I am melee character.

Second of all, I can't tell who is in game or who left the game because it only tells u once and you can't double check in score board.

Third of all, when someone says to all, it's in red so I can't tell which team that person belongs to although he is telling everyone.

I don't usually have a problem with conflicting health bars usually. The other two points are valid though, it'd be great to see like a grayed out faded area for the person who left and team colored chat (red/blue) for /all chat. Something that would make it much more clear is to have the player names be the team color but the text a neutral color like white where as team chat is all in your team color.

agreed on all 3points as well!

in addition, it would be nice to have different color for each players like in DoTA so you could easily distinguish who is typing what