I love the mechanic! It's simple to get but it can get incredibly complicated to resolve. This is a small experience but you have room to build a whole genre; it is like a maze with no walls. I think it is best when simple rules can elicit complexity, rather than setting complex mechanics for the smallest of the tasks (although there could be some joy here too, I guess).
What surprised me at the beginning was to see an RPG-Maker-like screen, only to realise, seconds after, that this completely shifted the conventions. The sounds of steps also reinforces the sense that every time you move, there ins nothing that stays at place; feels consequential.
There might be a good idea to remind the player which keys are for what (maybe in the corner of the screen?) but overall, its simplicity helps the player focus on the main game loop, which is solving the maze.