Next, you may wish to change your sketch to use the library frame functions, to run the sketch at a constant frame rate, instead of using delay() to slow things down.
arduboy.audio.begin(); add line:
arduboy.setFrameRate(30); // Run at 30 frames per second
At the start of loop(), before arduboy.clear() add:
// Wait until it's time for the next frame
delay(35); line near the end of
Now your sketch will run at a constant 30 frames per second. You don't have to use delay(), which you would need to keep adjusting as you add more code. You can change the frame rate to something other than 30 if you wish, to speed up or slow down the sketch.