Space Energy Circles 2.1

Hundred years in future energy is a big problem. Somewhere in space live circles full of energy.
Fly from circle to circle by tapping the screen and collect the energy. The smaller the circle, the more points you get and points are also awarded for distance travelled. Keep an eye on your remaining energy. Circles disappear making it harder the longer you survive. It is a never ending game, made harder by increasing speed and fewer circles.