Developer: Terry Cavanagh
Platforms: PC, Mac, Linux, IOS Universal
Price: $4.99, $2.99
So...I'm pretty late to the party here. Actually, given my love for precision platformers, I'm surprised I hadn't played VVVVVV earlier. But now I have, on both PC and IOS, and if I had to use one word to describe the game, it would be "masterful", Cavanagh's best work.
official site, Steam, and the App Store.