During development, you can leave the boot logo in, then to save time you can press the RIGHT button to abort it.
Also, you're currently forcing audio on and there's no way to turn it off to play the game silently. If you use begin() (or remove
arduboy.audio.on(); and add
arduboy.audio.begin() after boot()), then users will be able to enable or mute the sound using the B buttion during power up.