Sym

Sym is a single player platformer game with a horror theme. It was developed by Atrax Games and was released on May 7, 2015. It received mostly positive reviews from critics.

"Sym" is a puzzle-platformer game that explores social anxiety disorder, where you play as Josh, who exists as alter egos Caleb and Ammiel in contrasting worlds of light and darkness. Switch between realms to solve puzzles, overcome obstacles, and reach safety across 44 levels. Create and share new levels with the level editor, and connect doorways in the Shared World to interact with other players' levels.