Require typing the correct phrase when incorrect
For the option of typing in a phrase or word, when we get it wrong it just moves on to the next card. I feel like requiring/allowing the user to type in the correct answer even if the answer is visible allows for some internalization and output. As it is now, the input field becomes inactive.
For me personally it helps to type the correct answer in the address bar a few times to output it a few times myself, so think it'd be nice to have as part of the user flow.