Using Bolly as a turret, I had trouble defeating him in my testing grounds level. (Where I put theories and ideas before putting them in actual levels)
I added difficulty by using wind going towards him; it was supposed to give the affect he was chasing you, and with moving background, I think I achieved that. I could show you guys the level if you want. It was supposed to be part of a pack, but I guess it wouldn't reveal much.