Enemies automatically spawn from the corners and target you. Fly through gates to make them explode, instantly clearing them and all nearby enemies.

I made a number of changes from the original game.

Most notably, a green enemy will begin to spawn once you hit phase 3 of the spawning cycles. This enemy ignores the standard reds and flies across the board from wall to wall. Every bounce (whether off a wall, or off another green) makes it more dangerous, speeding it up and letting it target you more. With enough bounces, it turns into a deadly purple enemy.

Other changes include the board walls, which speed you up, and the rectangular zones near them, which slow enemies down. Gate sizes are also slightly randomized, you gain a shield on every new point digit (starting from 6 digits), and every second that passes makes the default speed of every sprite (including yourself) slightly faster.

The rest of the game is very similar though, such as flying through multiple gates to enable combo points, the instant game-over upon a single collision, and a slowly shifting hue applying to most of the effects.