This is one of those really weird things - a game that was released a year before the hardware it runs on.
Before the hardware? How's that even possible? According to this blog post, it was created for an exhibition - not to be sold in stores. It was an interactive kiosk at Expo '90 in Osaka, which was a giant garden and geenery exhibition; the game's sci-fi story is about the importance of plants to the environment, and I guess it made sense to create a disc with a 3-minute cutscene and short one-minute level for children to play while they were at one of the exhibits. Kind of reminds me of some of the minigames and movies you find on screens in museums.
Turns out, according to Wikipedia, Philips had finalized the CD-i spec and launched players for commercial use by mid-1990... and I guess this was using one! People always talk about the CD-i as a 1991 system, but I guess that just means you could buy one at home in 1991.