If you are making for the pc which has more power, you can add a few things to make it look nicer.
First, change the sprite from a square into a circle. Second, It looks like you are not using every tick cause there are gaps, this is good but try reducing it a bit more to make it look smoother. And lastly, give it a sine behaviour with the size option. Play around with the settings to get the best results, but with these three, I think you can get a really nice effect.