Developer: Michael Todd Games
Platforms: PC, Mac, Linux, coming to Android and IOS later
Price: $4.99, $7.99
(The game is still $4.99 on the developer site, compared to $7.99 on Steam, but according to the developer, they're waiting for the Humble Store to update the price. So act fast and it does come with a Steam key).
When starting up Electronic Super Joy, a screen warns that the game "may cause seizures! Also, cause motion sickness!" and that's not hyperbole. Electronic Super Joy is at once a psychedelic visual experience and a tough-as-nails platformer.