I would suggest you look into making just one frame for levels, and use actual level loading... which will require some work, and maybe use of a program like Tiled.
Besides that, just optimize as much as possible, reducing number of images used, size of images, make sure sprites are well compacted into sprite-atlases. Make sure you reduce collision detection as much as possible, and simplify the collision shapes as much as possible.
aside from that. test frequently on an actual device.