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The Humble Humongous Entertainment Mobile Bundle is live. All titles are for Android. You have to pay at least the highest tier price to unlock Steam keys.
Pay $1 minimum for:
Putt-Putt Saves the Zoo
Spy Fox in Dry Cereal
Freddi Fish: Haunted Schoolhouse
Pajama Sam: No Need to Hide
Beat the average (currently $7.60) for above plus:
Putt-Putt Joins the Circus
Pajama Sam Thunder & Lightning
Freddi Fish & the Stolen Shell
Putt-Putt Enters the Race
Pay $10.99 minimum for above plus:
Steam keys for all the games in the bundle
75% off one purchase of Humongous titles in the Humble Store