I'll second that. Insect damage is usually at the sides of the leaves or the base. Top cropping looks like something an animal, leaning over, would do.That damage is more likely an animal than an insect. Birds, squirrels, even domestic cats are known to munch on tender grasses.
As far as the failure to come up, apparently the germinating seeds need to stay moist. If you planted too shallow, and the soil dried out, then they might have died. You should be looking at 1.5 to 2 inches deep. If you pack the soil on planting then 0.5 inches is sufficient.