Electroplankton is a unique game, and anyone with an open mind can enjoy it.
A unique thing about Electroplankton, is that it is not a real game, per se. It's more of a musical tool or "toy". There is no objectives, no unlockables, and no progression. It's like Nintendogs, as there is no end to it. You simply play around with it, making music for your ears to hear. There is also an Audience mode, where the game makes the manipulations for you.
One thing that is extremely unfortunate is that you cannot actually save your music. If you have a moment of brilliance playing the game, it will be gone forever. While this does hurt that game, there are a few alternatives, such as recording it to your computer through specific programs.
All in all, you should be warned that this game is not for everyone. As I said before, it's not even a game, and it's not really in any way deep. But, if you have an open-mind, like music, like creating music, or just want to try something new, then you might want to give Electroplankton a try.