You are the asteroid field.

Hold & Drag = Size 1 Asteroid | Tap + Hold = Size 2 | Tap x2 + Hold = Size 3
Manage your Energy. Size 1 rocks refund 1 Energy when destroyed.
(Med/Hard Modes: ALL rock sizes refund 1 Energy!)

Destroy the Target before the timer runs out!

Score = Remaining Time + Remaining Energy