How to play Boundary Gate: Daughter of Kingdom on Mac

Long time ago, the First Mother created the world and blessed it with five magical symbols that would keep it in balance. The symbols were hidden deep in a sacred temple, to protect everything and everyone around them. Many years later, an adventurer named Finn was looking for work in the city of Ambrose. There was indeed much work to do: monsters roamed the country, the threat of war was more real than ever. One night Finn was strolling through the city when he suddenly spotted a young girl attacked by a monster. Naturally, he defeated the monster and saved the girl, who turned out to be a princess hoping to restore her father's kingdom. The two decide to work together and venture to the nearby city, that lies in ruins, overrun by monsters...