with Firewall puzzle shooter objects are not blurred.
it may be the speed of my objects I think it is not perfect.
you create games with construct and cocoon (prenium ? or simple ? ) ? the 3 games flappy sp... ninja...?
All my games are with Construct 2. Flappy and Firewall are via CocoonJS (simple) since they are both smaller games, which CJS works great for. Ninja is a huge RPG so CocoonJS would fall on its face, but Intel XDK is great for huge games (but currently without Ads/Store). I don't have the blur issue you seem to have, and when I try your test, I don't have blur either.
So its probably the display on your device/pc.