I can't believe I haven't heard of this game until last night! It's a mix of jezzball, xonix, and weaponry. Has great music, gameplay, and replayability. I've been hooked on it for the past 18 hours.
Here's an info sheet I found somewhere on the internets.
Requirements: Windows Mobile 5.0, 2003 SE or 2003 - supports square-screen devices
Overview: Tilelander is a surprising game that can be played as a puzzle or as an action game - it's up to you whether to play in a relaxed mood or with a furious attitude!
Game Features
A fun game that can be played as puzzle, with careful thinking behind every move Or in a furious wipe-them-all urge! It's up to you how to play.
Addictive gameplay with progressively unlockable levels and four difficulty settings for extra longevity.
Over 70 delicious levels combining a variety of gameplay, from peaceful tile filling and maze solving to more involved shoot'em'up. And good-humored level names too!
Refreshing graphics, blending a retro touch with exuberant color gradients.