flashing LED Heart

I made this for my girlfriend for valentines day :)

Its a heart with LEDs in it, that flash in different patterns and also works as a VU Meter. It is powered by a Teensy 3.2.

parts needed:
1 x Teensy 3.2
11 x 5mm red LED
4 x 3mm red LED
1 x 12mm tactile switch
1 x Adafruit Electret Microphone Amplifier - MAX4466 with Adjustable Gain
16 x 47 ohm resistor
1 x 10k ohm resistor
thin wire, I used something close to 24 AWG (tore up some old cables I had leftover)
5v power supply

op