Hello, thanks for playing!
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Yes, I used Love.js to export to the web (specifically Davidobot’s repo of love.js)
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I first draw in a low-resolution 320x180 canvas and then draw that canvas at a 3x scale on a 960x540 canvas, and then draw that final canvas to the window. There’s some intricacies in the middle like having an intermediary “shader” canvas and a UI canvas that gets scaled separately, but that’s mostly it.
Glad you liked the game!