Something like this. I can recommend You Pixelated pope's collision tutorial: https://gamemaker.io/en/blog/precise-tile-collisions-by-pixelated-pope -You can check it for precision reference.
In order to do precise tile collisions it would require a navmesh system, the A* is a grid based system and only handles navigation with rectangular collisions. I will look into it and see what I can do.
