I think that he should be able to get to his food. In the wild they must search for food across a very large range of space compared to their cages in captivity. When chameleons get hungry, they will hunt. If you do worry about him finding food, you can always use a feeding cup to put the food in. But honestly, I personally wouldn't go out and get a feeding cup unless I see no decrease in the amount of crickets in the cage.