1st Ludum Dare participation (compo). Genre: Shoot em up.

S: Fire laser x2  (1 pt)
D: Shield         (no damage taken)
F: Fire missile   (5 pts)
ESC: Exit game

Enemies deal 1 pt of damage with each bullet. You're starting with 50 HP. Game ends at 0 HP. You can't fire when the shield is up.

After a certain amount of time, the difficulty increases and the ship is repaired to full HP. The game ends automatically after level 20.

The goal is to balance shielding, firing and dodging to maximize the score.