After I managed to complete the final "rhythm" puzzle in Alter Echo (which requires near super-human hand-eye coordination to pull off), I found myself sitting in front of my TV, PlayStation 2 controller dangling from hand, craving more.
All kidding aside, Alter Echo is particularly interesting not only for its wet, squishy levels, but because of its release date. Like the way Hollywood often has competing films with similar content, Alter Echo hit the streets just after Capcom's Chaos Legion this past August.
Game Description: Multiplast is the most important substance in the Universe because rare individuals called Shapers can physically shape it into all sorts of bio-machines. You play Nevin, a Shaper who works for one of the many Corporations that mine Multiplast. You’re not just any Shaper—you can also Time Dilate, something most Shapers can’t do. Your employers have sent you to Proteus because a Shaper named Paavo has created a new form of Plast and it’s gotten out of control. The new Plast (called Xenoplast) has become self-aware. It knows that humanity plans to exploit it and it doesn’t want to suffer that fate. To make matters worse, it’s figured out a way to retaliate. The last thing you wanted was to have to save humanity, but hey—if you don’t do it, no one else will.