Move around with A and D and the left and right arrow keys. Press space or click to blast and try to defeat your enemies! More enemies also get added when your score reaches 5 and 10. Try to avoid getting hit with the enemy (red) darts! Also, different blasters are for different purposes. The Trooper Blaster (Press 1 to use) is better for long range. The Scatter Blaster (Press 2 to use) is better for medium range and blasts multiple darts. The Spray Blaster (Press 3 to use) is better for close range.
Thanks to @griffpatch for the health bar.
