The game is simple, but I think it might be a bit too simple. I really enjoy simple games, especially when they have a single core mechanic that's strong enough to carry the entire experience. In this case, though, just typing numbers from highest to lowest felt a little too repetitive for me, and I found myself wanting a bit more.
The visuals are nice, and I think adding a little more color could make the game even more appealing. The sound effects are also a nice touch and help make the game feel complete.
One thing I really appreciate about simple games is that they're often very polished, and this game is no exception. Everything worked smoothly, and the overall presentation felt solid. Nice job!