A ball-rolling game we previously covered has just gone on sale for only $0.99.
HydroTilt XL offers familiar tilt controls to control a bead of water on suspended platforms. The goal of each level is to find the a cold cube (which turns your drop of water into a ball of ice) and roll it to the goal. The game adds a number of additional obstacles, ramps and challenges to make the game far more interesting than your typical tilt-balance game.
Since we first looked at it, the game has received 30 extra levels as well as a built-in level editor with the ability to share and download these custom levels.