Otherplane

Mysterious entities are aware of your presence - and their anger grows as you near your goal. If you and your friends all fall, the game is over. However, you may discover how to use aspects of the environment to defend yourself.

Explore and solve puzzles to obtain items from the former lives of the entities. Free the entites shackled to our world by sending all their worldly tethers into the beyond.
If you die, your completed puzzles are remembered. However, memories obtained from puzzle completion will be hidden around the map.

Otherplane can be played solo, or with up to four players. Proximity-based voice chat gives you and your friends an immersive, cooperative experience.
You may revive your friends by reuniting their lost souls with their bodies. Beware, their souls may have ventured far. Be sure you work together to increase your odds of getting out alive.
Fearless players may attempt the game solo, though with no hope of revival upon death.

Otherplane offers four difficulty modes: Puzzles Only, Easy, Medium, and Hard.
In Safe mode, the entity will roam the map but cannot harm you. This mode is for those who want to focus entirely on solving puzzles.
In Easy and Medium modes, the entity grows more dangerous over time. In Medium mode, the entity spawns more often and moves faster. Your sanity will drain in the dark, influencing how frequently the entity appears.
Hard mode is for players who want a challenge. The entity's speed and aggression will grow even further with each puzzle you complete, and your sanity drain will have a greater impact.