Nova Strike

The ship fires automatically. You steer with arrows or WASD, or drag on mobile, with on-screen left/right buttons as well. Enemy types are added as levels go up: drones, zig-zaggers, gunners that shoot back (from level 4), and armoured tanks (from level 7). Levels 5, 10, 15 and 20 end with a boss fight, and the progress bar tracks the boss's health. Enemies drop orbs. Every 5 orbs upgrades the weapon (single, double, triple), and a hit costs 5 orbs' worth of power. You have 3 hearts. Stars d