A short and sweet puzzle game. I like the music. Relaxing and good for a puzzle game like this. I like that you kept the environment simple enough, so the clues weren't too frustrating to find. The letter puzzle, the one where you spell by either holding and clicking the button in a sequence, was the most interesting to me.
I managed to get all the doors open, however I was able to brute force the arrow puzzle in my first playthrough without having to solve the other doors first.
Nice job on this one!