N-back game scroll animation makes me sick

[noobshit]

https://noobshit.github.io/

I'm trying to make good old n-back game. Plaese use left/right cursors to rewind tape. Even after short playing session I feel sick. Are you feel the same? What is the reason, how to avoid it?

[mattstyles]

I think you're just getting old  same thing happens sometimes with rollercoasters you loved as a child!

It's almost certainly the movement of the white film squares, currently the animation looks linear and its large so your brain focusses on it, possibly try to use a different easing function so the movement of the squares is broken up a little (generally speaking linear animations/movements look bad anyway).

[noobshit]

Thanks for help. I'm sure it was a problem. I have huge monitor (30'' = 2560x1600) and on fullscreen shapes moved few cm each frame, it wasn't smooth at all. In fact I was 100% sure I had performance issues. 

I looked at https://jsfiddle.net/BinaryMoon/a68Qp/ and I'm using now Phaser.Easing.Quadratic.InOut. Now I have to improve few more things and my first game will be done. Thank a lot!