I think the main problem was on the front end before starting the game. The text explaining the mission seemed crammed to the left margin. This part especially could use a larger panel or maybe a border. It might save you some time and work if you buy a GUI pack from the asset store. I bought this one in a Humble Bundle but it might not suit the style of your game.
https://assetstore.unity.com/packages/2d/gui/gui-pro-kit-fantasy-rpg-170168