Kumobius has released a new purchasable chapter for their minimalist game, Duet, called the Encore Chapters. And once again you'll need to keep your two vessels in sync to survive the barrage of obstacles in your path.
The update includes a new story, music, and 30 new stages. It also includes new features such as two directional attack waves and boomerang blocks. Yikes.
You can download Duet for $2.99 and check out the new in-game update for $0.99.