You found out you're tied to your other self in a mirrored dimension, and to trye to free from this situation, you need to solve some puzzles.

Locked in: Your movement and your very life are locked to your other self. When they move, you move, when they die, you die.

Commands:

WASD -> Movement. Control BOTH characters at the same time.

J -> Interect with objects, doors.

ESC -> pause menu