That's very kind, thank you very much for your detailed comment!
It's my first game, so I tried to keep it simple with a straightforward concept like “guess the number,” and I tried to dress it up with graphics and interface. I'm glad you like it!
Oh yes, indeed, I used a kind of basic spinbox, but you can write anything in it. I hadn't thought of that!
As for the music, it's just the beatmaker's tag hahaha. I'll try to improve that in the future too!
Thanks again!