Its a fun little game ! Other than adding some things to do (like missleading clues, minigames, or more tiny clues) I think you could have fun adding some juice to your game.
I like to use Tweens in Godot to do just that, its a good way to animate things in code without too much work. There is also the shaker addons that can be used similarly with even less code.
You could use them to make the world feel alive, like moving cars, birds, cloud shadows, anything really. You can also “bind” the tweens to user interaction, so when the player do something, it feels like it has a big impact on everything around them.
If you have questions, it would be my pleasure to talk with you about it, just let me know!