“The game has started” could be an interesting addition. Also, it may be a good idea to make the voice notifications optional, so players can stick to the sound effects if they want.
Let me know if you need help translating the script into Portuguese, @anoek.
P.S.: Bonus points if you can get the voice actress who recorded for Tygem—for some reason, that’s the only countdown that doesn’t make me nervous. Or the one from Command & Conquer. \o/