Commander Keen in Keen Dreams (1991)

Trapped in a land where giant vegetables rule the day, you must fight your way through an army of vicious broccoli beasts, savage asparagus warriors and a bushel of other leafy green nasties before battling the fiercest spud of all, King Boobus Tuber. Unless you want a one way trip to the salad bar in the sky, you'll have to finish all your veggies. Before they finish you!