If your focus on this was boss battle design, you have a good foundation. It's just too easy to avoid the attack, I would go as far as to say there isn't any real gameplay here. Your selection of asset packs works well but I would like to see more than a player, enemy and a grey floor. It's my personal opinion that you didn't really meet the limitation. A crossbow wouldn't work without the arrow, therefore I would categorise that as one item, but the idea you have to retrieve the arrow after firing it is a good concept. Very Hawkeye. What you have is good, but I would like to see more.