Humble Bundle for Android 4 just added five new games. Enter Avadon: The Black Fortress (tablets only), Canabalt, Cogs, Swords & Soldiers HD, and Zen Bound 2. These games were first seen in Humble Bundle for Android 2 but if you missed it pick them up by paying over the average price.
All these DRM-free games run on Android and Linux. And many come with soundtracks and can be optionally redeemed on Steam as well as the Ubuntu Software Center.
If you have already purchased the bundle, you can access the games right now from your Humble Bundle download page and play them for free.