The method i found out was to play the game fullscreen.
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imma get this out of the way "link to my video" there we go, now what i think...
Imma be honest, this game it really confusing and should give some hints and to what to do, the crystal thingy does not seem to be any useful other then make enemy's spawn in a room and try and kill you.
Developer, in the next update, please make that crystal have some sort of use to the game.