Overall, this game had a unique concept/mechanic and a smooth implementation, and I'm sure it would be fun if I could differentiate color better. I failed within the first 10 bubbles since couldn't really tell which was A and which was S. This seems super specific to my particular (very rare) brand of color vision deficiency tho, I checked the colors of the game against the most common forms and the colors were distinct under all of them. If you picked the colors like that on purpose, thank you for considering accessibility. :)
I'm very impressed if you created this without knowing Godot beforehand, as the game's page sounds like.