Ok, I changed the build settings in unity to 960 * 540, had to leave the viewport at 560 to leave the fullscreen button on itch in view. Fingers crossed, and thanks for the feedback!
It was lagging pretty bad for me too yesterday night, but today it worked great, fun game :)
Good to hear, I changed the resolution to 960 * 540 as suggested to me, so was probably that.
