Frozen-Bubble has blissfully stolen hours and hours of my life with its addictive gameplay and flippin' awesome soundtrack. It's an easy game with a simple premise: shoot colors bubbles onto the game board in an attempt to match up three or more similarly colored bubbles.
Doing so will cause them to fall from the board, taking connected bubbles with them. If you clear all of the bubbles, you move on to the next level. If the bubbles pile up and cover the entire screen, you lose the game and restart the entire level.
Because my description is probably dense and hard to grasp, here's a video. By the way, no one gets to make fun of my mad Frozen-Bubble skillz.
The developer website lists the features well: