It’s a cute little gem, or alternatively, “Puzzle Bobble meets Ageia’s PhysX engine”. Lots of levels, user level editor, some AJAX magic and so on, and everything made in about four weeks. Matthew has some technical details for the curious.
But really, you should just go and play it: splume.flashbangstudios.com
* I stand corrected: When Orcs Attack also was made with Unity 2.0, and it was released earlier!