Nav Points (point graph movement) 2d map

Hi Unity,

Cutting this short to provide a simple image of what i would like to achieve, id like to refer you to the good ol' days or the NES :) specifically Super Mario Bros. 3, cause is is the last game that i can recall the uses a system like that. And the system is basically the way Mario moved around in the world map, while selecting a level.

What i was able to do is move my character is a grid based way using iTween, yet i was unable to restrict its movement to specific NavPoints. I tried placing obstacles and colliders, that method did in-fact restrict the movement yet the result was unprofessional and resulted in a bumping behavior which was undesirable. I also tried looking though the asset store and even though i purchased and found a few good assets they were not providing the functionality i desired even though they were pretty nice, and powerful assets, tweaking libraries to my desire is more of a brute force approach that would be too time consuming.

Sorry for the length of the question even though it is quite simple. lol.

All i would like to do is move my character around like Mario did in the World Level Select Screen, restricted to navpoints. My guess is create some points with just transforms, probably space them evenly to match the iTween movement distance covered. Link them together somehow (this is what i couldn't figure out) to restrict the movement to these points only, and then incorporate keyboard buttons that correspond to specific directions, which is quite simple and straight forward.

Thank you for your time Unity Community, and your assistance.

Cheers,