Two favorable reviews for Tidalis have hit relatively recently via Digital Hippos and DarkstarMatryx. Here's a bit from each (both are very enjoyable reads):
"I am not a puzzle gamer. But for those of you who are; for those of you undaunted by the likes of Bejeweled, Puzzle Quest or Clash of Heroes; for those who find no sport in World of Goo or Plants Vs. Zombies, there’s Tidalis: a game that never ceases to build upon itself, exponentially, until the ethereal mind-space between your brain implodes into a singularity that devours reality as we know it."
- Christian Higley, Digital Hippos
"Tidalis is another game in the family of falling block puzzle games, but with some entertaining differences...If you’re a casual puzzle player or a serious one, chances are you should be interested in this game."
- Raymond Matthews, DarkstarMatryx
Each review concludes by rewarding Tidalis with a 4/5 score. Thanks to both sites for taking a look!