ATtiny program - runs once then stops

Hi, I’ve uploaded the following program to a ATtiny85 with a USBasp. When I power the device it seems to run once, then stop.

int input = 0;	// the sample right now
int avg = 450;		// average, start at 1/2 scale
int env = 0;		// envelope of audio
int filter = 15;		// smoothing of average, bigger = more smooth

// Pin allocations for ATtiny85
int mic = 2;
int lights0 = 1;
int lights1 = 0;
int lights2 = 4;

void setup() {
  pinMode(lights0, OUTPUT);
  pinMode(lights1, OUTPUT);
  pinMode(lights2, OUTPUT);
}

void loop() {
  input = analogRead(mic);	     // read a sample
  env = input - avg;		     // envelope is difference from average
  
  if (env > 200) {
    digitalWrite(lights0, HIGH);
    digitalWrite(lights1, HIGH);
    digitalWrite(lights2, HIGH);
  }
  if (env < 160) {
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, LOW);
  }
  
  avg = (filter * avg + input) / (filter+1);	  // form the new 
  delay(1);
}

My connections into the ATtiny are correct (VCC -8, Mic analog - 3, GND -4, etc)

The code works fine on my Arduino Uno.

Does anyone have a reason why this would be?

You have assigned mic and lights2 to the same physical pin.

So I did, thanks for the third eye :)