Wheel of Fortune style (Toss Up) daily puzzle

Hi design experts! I created a game (works on desktop but it's best on mobile) to practice my own Toss Up knowledge and I'm looking for design/UI feedback. If interested, check it out at www.flipphrase.com

It's a daily puzzle, and letters are automatically revealed every 3 seconds. When you recognize the phrase, you can tap STOP and the letters will stop being revealed. Then you can make your guess... if it's wrong, the letters will reveal again, but you won't be able to stop the auto-reveal mechanism. I'm looking for general feedback on the website - e.g. what could I improve to make it more user-friendly or fun to play. A new puzzle is revealed at midnight central time. Thanks in advance :)