Poor collision detection
The graphics were pretty nice, but the difficulty seemed to be related more to Voly's hitbox being too big than to the gameplay. It's way too easy to get blocked by a corner on a piece of scenery that the character isn't visibly touching. Also, the rules determining whether or not a Bubba slapped you seemed illogical - for example, if a rock stands partially in front of a Bubba's non-slapping hand, he won't hit you, even if you're standing directly in front of him.
This game struck me as being "defective by design" - the difficulty and solutions to puzzles look more like bugs than intentional design decisions.