Hello Alix, I can confirm that the character spriter are not scaled on their own. The whole game may be scaled to fit the window, and that could cause the issue. When you open the folder of the game there's a file called config.js, there you have a variable "scaleMode" that can take the values: EXACT_FIT (will scale to fit the window exactly), NO_SCALE (will not scale), SHOW_ALL (will scale but maintain proportions). Try using NO_SCALE and see if the issue is fixed. RenJS is based on Phaser, the assets are loaded exactly like in this example https://phaser.io/examples/v2/basics/01-load-an-image, may you try to use your own in an example like this and check if the problem persists.