Scale of the universe
I personally really like this game. Despite having no plot whatsoever, it is really fun. Let me explain why. The game is really simple. What you do, is scroll throughout the universe. It shows virtually everything starting from the largest planet or star that we know of, and as you scroll, goes to the smallest particle in known knowledge. It's really fun and quite mindblowing. Hope you like it!
Cell Craft
This game takes place in a world entirely inhabited by platypi. Two scientists in this world are working on genetically engineering a cell. During their research, the get a call from the mayor, saying that astronomers have found a giant meteor headed to their planet. The mayor tells them to send their genetically engineered cell off to a planet they named "Earth". In this game, you must battle bacteria, build energy, and fight for survival. You will also learn about the basic facts about the cell.