Interesting and well done.

(as i was playing i had a idea, its a silly thing but i imagined im trapped  in a cave or in an island and i have this tool and i can use some options 

a vibrator that tells me how to do each letter , i can hit a rock to tell a message

a flashlight that translate the messages with flash pulses

or even a high pich sound that makes the message louder haha

sorry for my English.

and thanks for the time and the work that you did