hey, thank you for playing! I would suggest you to play the downloaded version because the slow and jittery movement is mainly a result of WebGL. And may I ask, which aspects you would improve concerning the skybox?
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The movement is not too jittery. By improving it I mean you can limit the amount the user can tilt up and down since coupled with the same colour of the top and bottom parts of the sky, it can get confusing which side is up (which happens often in Unity & Blender). Not a big deal, but maybe it's just me.