You are free to use any game engine or library as long as the build/export is playable in the browser. We recommend using Phaser, Defold, or GDevelop, you might also consider Cocos or 8XR, if you'd like to aim for multiplayer you can check Colyseus or Modd.io, and if you need an extra challenge, you can try the js13kGames-specific size-constraint ones like Kontra, Goodluck, or LittleJS.
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