Oh man, I am a HUGE Mushishi fan as well! I read the manga when it was still a series in a magazine back home. I loved every single one of its episodes. I even have the special spin-off episode manga book. So you picked up the subtle reference/inspiration there. Awesome, true fan!
And boy, thank you so much for such high praise on the game. Really appreciate it. (The sfx on the mountain hike, I was actually thinking about "The Sore Feet Song" :D)
The screen size is always a bit of a headache for me when I make games but I'll make sure to include the full screen mode next time for the visual-driven ones at least.