What surprises me is the DS lack of more metroidvania games like Monster Tale.

I was sold the second they said from the makers of Henry Hatsworth.  I only wish it has the awesome Tea Time theme in the game.

Hatsworth is a great game.  I'm sure you can pick it up at bargain prices these days. 
 
I am also intrigued by this type of game.  I like that it is low impact with the touchscreen usage too.

Definate for me.  Ghost Trick, this, and Okami Den are causing me to pull my DS out again!

I never heard of this game until I watched the quick look today. I am sold now as well. I love metroidvania-style games. I agree, it's surprising you don't see more of them on the DS. And this game looks extra cool because it has that classic SNES-esque, cartoony art style to it.

I really hope Brad reviews the game.  The game looks great.

Just put in my pre-order :)
I also hadn't heard of it until the Quicklook, but was instantly sold. Metroidvania is definitely an itch that doesn't get scratched enough.
Took out my DS for the first time in ages for Ghost Trick, and when I finished that I instantly got hooked on Picross again, so it'll stay out for a while longer it seems.