Keen Dreams

"The Fourth Commander Keen game in the series.

After refusing to eat his vegetables, Billy is sent to bed by his parents. He falls asleep, only to awaken in a strange vegetable kingdom led by the evil potato king Boobus Tuber, who has imprisoned other sleeping children there. In the dream world, Keen does not have his trademark raygun and pogo stick, but has to defend himself with "Flower Power" seeds that temporarily turn enemies into flowers."

Source: Wikipedia, "Commander_Keen," available under the CC-BY-SA License.