Minus decendance: Before the event

Story: Your name is Jack and youre the scientist who worked in the facility down in the underground. One day, thing went horribly wrong. All monsters broke out of their cell and youre the last one alive. You managed to make it to the elevator but it doesnt work until you press all the buttons. Find all the buttons and head back to the elevator while avoiding the monsters roaming around the facility to win. This is a fangame based on a Roblox game called "Minus decendance" made by Vanilla Deluxe....