PRISM HORN

Play it now: https://js13kgames.com/2026/games/prism-horn

PRISM HORN is a colorful arcade survival game created for the js13kGames 2026 competition.

Aim the unicorn's horn, switch the laser color, and destroy matching enemies before they reach the defense line. Gain experience, choose upgrades, build powerful combinations, and survive recurring boss battles.

1. Use ← / → or A / D to aim the horn.
2. Use 1–5 to select a laser color.
3. Use Q / E to switch to the previous or next color.
4. Press Space to fire.
5. Press P or Esc to pause.
6. Press M to mute the sound.

• Move the mouse to aim.
• Click to fire.
• Use the mouse wheel to switch colors.

• Drag to aim.
• Release to fire.
• Tap the color buttons at the bottom to switch colors.
• Landscape orientation is recommended.

Only a matching laser color can destroy an enemy. Shapes provide an additional visual cue for distinguishing colors.

• Five color-matching laser attacks
• Mouse, keyboard, and touch controls
• Combo and score multiplier system
• Elite enemies and formation patterns
• Roguelike level-up cards
• Split beams and mixed-color lasers
• Automatic color portals
• Recurring boss battles
• Powerful boss rewards
• Rainbow Pulse every fifth shot
• Procedural graphics using Canvas 2D
• Procedural sound effects and BGM using the Web Audio API
• Local high-score and mute preference storage
• Main menu, story letter, pause, and run result screens

Defeated enemies grant Prism XP. When you level up, choose one of three upgrades.

Possible upgrades include:

• Faster firing speed
• Wider beam hit detection
• Additional shields and recovery
• Combo protection
• Higher multi-kill rewards
• Enemy slowdown
• Automatic color portals
• Faster portal attacks
• Additional beam branches
• Mixed-color attacks

Bosses provide a separate set of more powerful rewards.

• Created for the js13kGames 2026 competition.
• The 2026 theme is Unicorns and Rainbows.
• Built with Vanilla JavaScript and HTML5 Canvas.
• No external libraries, images, sprites, or audio files are used.
• All graphics are drawn with the Canvas 2D API.
• Sound effects and BGM are generated with the Web Audio API.
• The submitted ZIP fits within the 13KiB competition limit.

The English article is a translated version of the original Korean post.

• English
• 한국어 원문

• js13kGames: https://js13kgames.com/2026/games/prism-horn