1. The enemy needs to be a little bit slower but i'll make him a lot faster. Currently his speed is 159 and the players is 160. I'll change it to 159.9.
2. I'll give him a circle collider. He currently has a rect collider.
3.1: it's opensans but i get your point.
3.2: nice idea. I'll replace the text with icons
3.3: i'll replace the graphic for the restart button. it was drawn in less than 2 minutes xD