I'm not well versed in geography, but I can appreciate this Wordle style guessing game. The clue system didn't help me much personally, but revealing the first letter of a country, for example, might make it too easy if a player already knows the continent and there are only one or two countries that share the same first letter. For some continents, that specific clue could be overpowered.
The UI is pretty intuitive, but I'm not sure what it means when a bubble is yellow instead of red or green. Does that mean it's close to the real answer?
If you haven't added it already, a ranking system to see how fast you solved the puzzle compared to other players worldwide might be cool.