To the left of the rocks there is one more walkable wall and a split path that will lead to a switch and a cave. The old man in the cave has the solution to the maze.
After all that, you might want to go to Neon Park first to get the hookshot. You wont be able to beat the alien ruins dungeon without the whistle.
Edited by Titanium Justice, 13 November 2019 - 12:35 PM.