Nice! I really enjoyed this game. I've never played Fez, but I think I might have to get it because this was really fun. I was able to figure the language out (with a bit of difficulty). Two of the letters being the same really confused me; I thought I had just messed it up somehow, lol. The true question: What happened to K and Q?? I was able to find every other letter... Or did I miss something?
Hey congrats!!! Always heartening to hear players figure everything out, especially without prior FEZ experience :D
Regarding your language question:
You can definitely find K - one message mentions "skies"!
Q is technically not used in the game but if you learn how the Zuish language works in the original FEZ it follows the same mapping.