Johann Seidenz - is a video game designer. Johann Seidenz began his career in 2017 and has worked for companies such as Klei Entertainment. Johann Seidenz's first game was Oxygen Not Included which was released 6 years ago. Best Game Johann Seidenz contributed to was Oxygen Not Included. Johann Seidenz's latest work is Oxygen Not Included which was released 6 years ago.