Tilt To Live. The "Viva la Turret" mode is available as an in-app purchase and centers around the strategic use of a powerful new weapon: the Perferator turret. This bad boy provides 360 degrees of defense against the game's relentless red dots, but only lasts for a limited time and needs a short period to respawn between uses.
Those who already own Tilt to Live HD can get the Viva la Turret add-on for $1. One Man Left has decided to include the mode for new buyers, but has bumped up the game's price from $4 to $5 as a result. We'd say the shmup could be $15 and we'd still buy it in an instant, but we don't want to give anybody ideas.