The first Game Frame ran on Arduino Uno, not Teensy. I think you’re better off just getting NeoPixels working. It should be a simple matter of running the right Init.
Trying changing this line:
FastLED.addLeds<LED_TYPE, DATA_PIN, CLOCK_PIN, COLOR_ORDER>(leds, NUM_LEDS).setDither(0);
To this:
LEDS.addLeds<WS2812,DATA_PIN,COLOR_ORDER>(leds,NUM_LEDS).setDither(0);