Ok! A lot going on here. Let me just throw some pointers at you.
-You can reference the player character in its own blueprint by searching “this” or “self” in the context browser.
-There’s a node called “Get All Actors of Class” that will return an array of actors of the specified class. You can get the tiles and then plug the return value into a local array. No tags needed! After getting the array, you may want to run a foreach loop on it that gets teh display name of each tile and prints it so you know your array is good.
What base class are you using for your player? Pawn, Actor, Character? If you’re using Actor, reparent (File->Reparent blueprint) the character blueprint to use Pawn or Character since they’re built to take input. In the class defaults, make sure it’s listening for input from Player 0 and NOT blocking input.