Wow, I already finished the game. I still like the game, but it's not a deep experience at all. I know I have a whole slew of fish still to discover, but even then it all feels a bit on the light side. The technical side of the game is decent enough, but again not impressive enough to be truly immersive (for instance: fish don't react to anything...at all) and the 4-sounds minigame is more annoying than anything else. I'm not gonna count the horrible (yet hilarious) translation as a downside, because the game hasn't even been released in English-speaking territories.
I don't wanna come down too hard on the game, because it really is a nice and relaxing, non-taxing game and it's pretty much unlike anything I've personally played yet. But when it comes down to it, the few hours it takes to complete the game don't really justify the 50 I payed for it. They could've done so much more with it, but I guess that would take a bigger budget.
I'm glad I have the game and I still recommend it, but I hope that when another one of these comes along there's a bit more to it. If so, I'm there.
/edit: also, I just ordered Hakuna Matata (Afrika) because I feel like playing another one of these games.