My mother is a teacher and has run into this type of issue before so I got it right away.<p>Some thoughts - the gray text is hard to read on the gray background, it's a bit minimalist so it's hard to get the whole picture without lots and lots of scrolling down the page, for numbers less than ten - most people will write out the word as it's easy to get lost in the numbers (which I did), excuse me would like like to try a sample comes across as cutesy and doesn't really help convey the message, I was confused as to why you didn't show all seven of the activities that are available, hard to understand how to enter the 25 words into a single text box, it took me a while to realize that I had to press enter in the box and that it would expand automatically, the text box currently registers a comma "," as a word - might want to discount grammatical symbols, the 99 cents checkout at the bottom caught me a bit off guard.<p>Overall, congrats on shipping something that looks neat, solves a real problem, and are charging money from it. I would suggest thinking about how to improve the user flow so that I don't have to scroll down tons of times.<p>Good luck!