Made a class Constants with the Colors of each different game entity and properties of PhysicsEntity so you change ALL colors in the Constants class. You can set the color in the level editor for building level purposes but it won't show up in the game because everything is overrided by setting color in setProperties to the appropriate Constants.COL color. Also added a border to level 1 because it needs some sort of ground or else it looks the same as the levels where you die when hitting the black. Also fixed the ConcurrentModification bug with the didCollide() in Player.draw by storing _didCollide as a boolean updated only on each tick