JumpO - Jump or Die : Help the decided João to survive the most lethal machine ever created!

Hi guys, Im working hardo to develop this android game, and I really need some feedback, about performance, design and new ways to improve it.

The focus is in casual gamers, so the game must run well in any device. I really apreciate the help.

To grab the current version os the game click here:
Here follows the video tease:

Some screens:

Thanks guys!