У вашего броузера проблема в совместимости с HTML5
Prison Architect updated early for Christmas, bringing us to update #28. What is in store? Some back-end improvements, fewer tunneling escapes and micromanagement!
Full patch notes here: http://www.introversion.co.uk/prisonarchitect/builds.html#
Prison Architect is currently an Early Access title on Steam and so still in development.
Prison Architect is available on Steam (Early Access) here: http://store.steampowered.com/app/233450/?snr=1_5_9__205
Alpha build 28 by Introversion Software