I couldn't make it past the second levelš¤¦āāļø, but nevertheless, I loved the concept!
Viewing post in Shadow Friend jam comments
Were you able to push the box in the shadow plane? There seems to be a very weird bug for some devices (I would honestly attribute it to the build...) where the cube cannot be pushed by the player. If you can push it however place it on the button on the ground. You should be able to guess what to do from there :P