This is the scp 106 experience. You need to grab your keycard and a radio then reach the checkpoint and get out of the zone you are in. WASD to move, if you want to go to the main menu, click the green flag. you will lose no progres by pressing the green flag. you can buy skins, but wont change the game over screen or the you win screen. there is a code that stops items from spawning in walls however it doesnt allways work, so before the power cuts our, check to see if the radio and the keycard are visible the door to the checkpoint room is a gray rectangle. if you get caught you will get transported to the pocket dimension. to get out of there jump into a hole, be careful in the pocket dimension because you may get hit by a boulder which will kill you instantly. you lose 1 hp every second in the pocket dimension. have fun!
took some sounds for Zapsplat and some sounds from SCP Containment Breach remix only if i give you permision no advertising in the comments