Well this is weird.
The iPad version is pretty easy to get the hang of. I completed the Whale and Larva sections before deciding it was about time for me to do some coding. I still had trouble moving at times, but for some odd reason a failed swipe seems less frustrating than a failed keypress.
Even the puzzles seemed easier. Swiping towards stuff suggested where stuff was going. Pressing a key meant I had to make an association in my head, and it never seemed to do what my brain reckoned it was going to do. I was trying to solve puzzles on two fronts.
Today in the office we were talking about Edge and my coworker asked me how the controls were - I reported that they were really hard compared to the computer version, but felt like how the game was actually meant to be played. It was harder, but also more fun. Another guy in the office was surprised at this and said that he couldn't use the computer controls at all (he started off on the iPhone version) and in his opinion the desktop version was an inferior port.
My only bug bear with the iPad version is that the larva balls look a bit ugly (something about the flat lighting on everything else contrasting with the style of lighting on the larva balls). Otherwise quite interesting to play.