The y in "myran" is long, while the y in "tycker" is short. All vowels have a long pronunciation and a short pronunciation. Unlike in some languages you might be more familiar with, long vowels aren't just held out longer; rather, they have a different sound altogether. Typically (but not always), a vowel is long if it's followed by only one consonant (or no consonants), and short if there are more than one. That's why you might notice there are a lot of doubled consonants.