You're Merlun - a young wizard's apprentice whose mission is to find pieces of an ancient summoning ritual in order to summon a demon.
MS Windows, Mac OS X
Tools and Technologies:
Unity (any product)
Extract the .zip file and take the file named with mac_build. Double click the build to play.
Extract the .zip file and take the windows_build AND the data folder. Double click the build to play.
Music and sounds from freesounds.org
All the other things credited for the developers.