I struggled to figure out how to play because the instructions are lacking. But it's fun once you get the hang of it.
Here are the rest of the instructions:
1. After the vowels are displayed - click the keyboard to fill in the missing words in the order they must appear.
2. When you've filled up the row, click Enter to submit the word and open a new row.
3. If you get an error or make a mistake clear the places words using Back on the keyboard.