Nice game with a cute art style. The biggest flaw is that once you figured out all the combinations, you're kind of just stuck going on indefinitely, since you aren't going to loose if you keep getting them right and there isn't really a clear win condition.
There's also some bugs I noticed while playing. Nothing that really got in the way of gameplay but things I wanted to bring up never less. For one, the music doesn't loop so I ended up playing the majority of the game in silence. A shame since it is nice music. Secondly, I noticed a few visual bugs on the browser version. Specially with the font of certain numbers. It's something I've ran into several times in my own development, so I recognize this is tied to html versions of Godot games not fully recognizing certain fonts. Easiest way to fix this would probably be to use code to force the font of your numbers into a more basic font. Something that computers would typically have on them by default.