Instructions
Defeat the boss in Holoska to get the stomp ability. A tutorial box appears explaining what button sequence to use in order to stomp down on things. The ability allows you to break through certain objects and push down platforms, switches and buttons.
Enter the Spagonia Entrance Stage during daytime. Explore the very beginning of the stage until you find a gate made of crisscrossing lasers. Find a large switch nearby. Use your stomp ability on the switch to deactivate half of the lasers.
Explore the surroundings for a set of pillars. Jump from pillar to pillar until you get to the top, where you will find the second switch. Stomp on the switch to fully deactivate the laser gate.
Jump down from the pillars and walk through the deactivated gate. Straight ahead, you see the wall jump shoes. Grab them and you see another tutorial box congratulating you for unlocking the ability and explaining how to use it.