You can't really see it in the video but if you click and hold a consonant, a popup shows you the 4 (other) vowel options. You can then flick after seeing the o

You can't really see it in the video but if you click and hold a consonant, a popup shows you the 4 (other) vowel options. You can then flick after seeing the options. When used this way it is sort of like a training mode. The main reason they can get away with this is because the consonants in the language are so regular. The only real exceptions are the single "n" sound and a few rarely used "y" consonants. It would be harder to do in english.