I have a Wii U, so I was able to play the game as well! :D
Pretty interesting! I haven't played a Construct 2 game on the Wii U browser before! (I think I tried playing a game I made on it, but it didn't work.)
I have noticed that when I turn the Gamepad around (somewhat violently :P), I accidentally press the back buttons, which brings up the tabs! (Not sure if anything can be done about that though...)