Hi there! This pack is designed for platformer games, so there's only 2-direction movement (by flipping the sprites). Sorry to disappoint. I'll have to put 4-direction monsters on my to-do list!
I'm not sure if I'd be able to do it for this pack specifically... The perspective on the monsters is side view. If I did 4-direction monsters it'd likely be a more top-down perspective and an entirely new asset pack.