itch.io

To give a non-engine-specific answer, when rendering pixel art in a game, it is very important that a) it is always displayed at an exact multiple of the native file size - 1x, 2x, 3x, etc (and not, say, 1.24x) or it will become very blurry/uneven and b) if it's not at 1x, you need to use "nearest neighbor"/sharp rescaling, otherwise it will become somewhat blurry.