I tried it on my Nexus 7.
It looks lovely, and overall presentation is great!
I found playing the game with the virtual joystick very annoying, but I don't really know what alternative controls you could offer (have you tried tilt controls?). My Ouya should show up next week so I'll give the game a go with a proper controller then.
I didn't always feel like the game window was big enough to let me see the hazards ahead of me. I don't know whether that comes from scaling the game to fit different device aspect ratios, or just that my reflexes are old and slow.
The distinction between game objects and background isn't as clear as it could be. In particular, I kept trying to jump over the rock shown in the screenshot a couple of posts back. Maybe you could fade the background images a little?
Finally, I know it's just a test level, but I didn't find that the level design really grabbed me. I can't put a finger on anything in particular, but over the years I've jumped onto millions of platforms, collected countless stars/coins/whatever, and fallen into way too many pits - and currently Mega Melon didn't feel like it was giving me a reason for doing that all over again.