Electroplankton is not a game, at least not in an usual sense. Games usually have rules that tell you what to do to be better than other players. You play and improve your skills. That is what keeps you playing. However, in Electroplankton there are no rules which would justify whether you are good or bad. You play it the same way for the first and thousandth time. Is it interesting? Unfortunately, no.
The problem with Electroplankton is that each one of ten modes of play is terribly simple. Each one is interesting for first 2 minutes and then, after you explore all possibilities of touching and making different sounds, there is nothing to keep you playing.
What's more, some modes of play are just miserable. For example, the first mode where you draw lines for each one of five small creatures. You draw a line for the first one and some fast and random sounds start. You draw a line for the second creature and you get another sequence of random sounds playing together with the first one. The problem is that these sequences are not correlated at all. Having three or more is just unpleasant experience and belive me - you cannot hear to such chaos without irritation. Each mode of play has similar problems, it is either boring or misdesigned. Frankly, there should be not 10 but at least 100 of such modes, it is so simple to think of new and more interesting ones.
Personally I am deeply disappointed with Electroplankton. After few reviews I've decided to try it and it is definitely the worst DS game I own.
Is there a place for such experiments on DS? I do think so. However, Electroplankton is definitely not a sucessful one. I have seen a lot of better freeware music software.