We went with a very simple style for this game so we only had a melee enemy and a ranged enemy. As the game was designed after Zelda the ranged enemies used a movement and attack pattern similar to Octorocks from the original Zelda which means 4-directional movement and attack. I believe the melee enemy was designed after Darknuts from the original Zelda but I a bit more modern. They no longer move in just 4 directions and rotate smoothly but they still retain the function of being able to block attacks from the front. The blocking mechanic was done by calculating the angle of the attack compared to the angle of the enemy and just checking if the difference was less than a selected value.