Axis Tilt is Critical for Life
The tilt angles range from zero for Mercury to 90 degrees for Uranus. Both extremes produce drastic temperature differences across the planet. Mercury, close to the Sun and tidally locked to having the same face toward the Sun all the time, ranges from extreme heat at the equator to ice at the poles. But for angles above 54 degrees, the poles get more energy than the equator. "Although our viewpoint is certainly biased, our planet's tilt axis seems to be 'just right'". (Ward and Brownlee)
Not only is the Earth's angle of tilt close to the optimum value, it also seems to have been essentially constant. That is crucial for the development of advanced life. Since there are torques which could have caused the axis direction to change, it appears to have been the stabilizing effect of the Moon that has kept the spin axis in a stable direction to provide a stable climate for life.
Habitable planet concepts
Ward & Brownlee