• Overall: Great start to a cool idea!
• Fun: The movement and shooting/aiming felt pretty smooth!
• Visuals (Graphics):  Some Unity prost processing + squash and stretch animations would make the simple shape art much better. 2D lights too~
• User Interface: Nice start~ the leaf pixel art doesn't match the vector art style much, but perhaps you plan to do pixel art later?
• Audio: It is better than no sound hehe. Once you do the life tree art, some ambient wind and tree sounds would be nice.

Nice start and keep it up! Please check out my game when you can :D