This game has so much depth to it. I think its complexity is what kept me from playing it much as a kid. There's a lot to do: dig, throw ball, eat cherries OR kill monsters, push apples, dig under them to make em fall, go for the prize in the middle or not... etc.
The enemies do a lot too for a game of that era: chase, dig, eat apples, even push apples! Impressive for that era.