This happens only in Node-WebKit and there's no way to reproduce the error I think, it's more about graphics.
I started using a laptop recently so I tried my game in different versions. Everything is ok but not when I export to Node-WebKit, here's what happens:
This is Canvas, sprites are sharp, that's good
This is WebGL version, hero sprites and wall cracks are blurry
But I don't wanna use Canvas, WebGL is da best! Any workaround or fix for this, guys?
Video card is Geforce GT730M btw.