Best puzzle game to come out this generation.
The idea behind the game is pretty simple - given some input, produce some output. As you go along through the game, you are given more complex chemicals to use and produce while at the same time gaining more tools to accomplish your goal. What's interesting about this game is that after you complete a puzzle, your stats are uploaded to their database and you can see how you did compared to other people. This is what makes this game so fun, you can go back to previous puzzles and improve upon your previous design. Whether that's by reducing the number of tools or time, or both.
The graphics of the game are simple, but looks sharp. There's a story, but it's given only through a page every 4 or so puzzles you complete. This may take you a while because once you get to the very difficult ones, it may take you multiple sessions just to complete one puzzle. I believe that makes the game more fun though, because you get that feeling of accomplishment after you complete a difficult one.
All in all, I would say this game is a must buy and that it's a shame not many people know about it.