Thanks for playing! That's strange though... The arrow keys work for me on all versions of the game that I have. Which version are you playing? Does anything else not work, or is it just the turning?
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Ohhhh I see! I uploaded a version of the game that uses J and L for turning and IJKL for menu navigation. Unfortunately I don't have the demo project files anymore, so I could only update the full (paid) version of the game. It's also been updated on the Steam version (as a free DLC of Fuchian Chronicles) if you'd rather get it there ^^