Betpoint

Betpoint's Space Invaders constrains the player gun to horizontal movement along the bottom of the screen, the same design as the original arcade game.

Aiming requires positioning the gun directly beneath the intended target before firing, since each shot travels straight upward from the gun's current horizontal location.

Dodging alien return fire also uses horizontal movement, which means the same left-right input serves both offensive positioning and defensive evasion simultaneously.

In later waves with a fast-moving alien grid, the tension between holding an aiming position for a high-value shot and moving away from incoming fire defines the skill ceiling.

Space Invaders is offline at 60fps with local score storage and no registration required.