The letter Y should count as a vowel in specific words

[*****id]

The letter Y is cleary used as a vowel in many English words, e.g. in "why", "myth" or "synergy". The game only considers a, e, i, o, u as vowels though.

I guess this would need a dictionary with metainformation on which letters represent vowels or an algorithm that analyzes the phonetics. A pragmatic solution that already covers many cases would be to consider Y a vowel if there are no other vowels present (a, e, i, o, u). From my own example this would solve the "why" and "myth" case, but not "synergy".

[Bacon Bandit Games]

I gave this issue a lot of thought during development, and ended up deciding to just keep a e i o u as vowels to simplify things. I also read several opinions on it like this one[en.oxforddictionaries.com] before making the decision.

[*****id]

Ok, it's good to see that you gave it thought during development. I'm sure you adjusted the algorithm for letter frequency accordingly. In my entire playthrough of 100%ing story mode I only had a grid of letters without vowels a single time. So it works exceedingly well either way.