The other is a matter of intended audience. The randomness of the dice over the sort span of 8 turns might not be an issue for casual gamers or 8 year olds. It would be for most serious gamers.
Good point - I might try play testing it with unlimited movement - any ant can move any number of squares orthogonally in one direction with the same restrictions (pop can, gum etc...) in place. Ants and other bugs also restrict movements. Obviously, the edges of the board stop movement.
If dice movement remains, I have also thought of the following: if a player rolls an eight then they can move in more than one direction (not diagonal). In other words, they could move three spaces up, two across, and three up, thereby avoiding an object and getting to food they need.
MORE PLAYTESTING NEEDED!