Thanks for posting. It's an interesting concept, but needs some work in my opinion.
First, that chart is super zoomed in. You can't zoom out or switch timeframes. You're not told how many bars you need to predict. You're not told the dates or what the stock is.
Not much you can see there other than a handful of candles, that's doesn't really tell you much.
If the stock and dates are a secret so people don't cheat, I don't see why. People can cheat on Wordle or Worldle, and they're still fun to play. But here you're basically just guessing, you have so little information it's basically a coin flip.