You can do the following:

Slow down the rotation by reducing the angle increment (currently 0.01)
Map the angle to a color using sine waves. For example:
```python
color = (math.sin(angle) * 127 + 128,
         math.sin(angle + 2) * 127 + 128,
         math.sin(angle + 4) * 127 + 128)
```
This will cycle the red, green, and blue components of the color as the square rotates, creating a nice coloring effect.

So the updated code would be:
```python
angle += 0.005  # Slow down rotation
color = (math.sin(angle) * 127 + 128,
         math.sin(angle + 2) * 127 + 128,
         math.sin(angle + 4) * 127 + 128)
pygame.draw.polygon(screen, color, ...)  # Use color instead of BLACK
```
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