I'm making a simple game in phaser ( http://victak.github.io/SuperDuperMegaDeathBird/ ), but am struggling a bit with making it look good on my smartphone (a nexus 5). Thing is, the graphics are pretty crisp and nice on the computer (my screen reso is 1366x768). But in my mobile device, it's not bad, but not crisp as it was intended to be. How can I remedy this issue? I tried increasing the assets png size, doubling it and then using this.objectHere.scale.setTo(a,b) to scale it down, but it still isn't good enough. Increasing x4 and then scaling it down makes it too pixelated (image too big scaling to too small).
Do you guys have any advice on how to remedy this problem?