thanks for playing ,
Not sure what is happening . maybe you are under one of the lower platforms, you are not able to jump directly on to a platform form beneath it .
Nothing amazing by today's standards but still decent: i7-7700K, GTX 1080, 16gb RAM, internet is Australian but still fine since I'm pretty sure the whole game is downloaded before the start of play. On reflection, surely it can't be framerate because others would have to have better systems than mine too and I seem to be the only one with this issue lol
I've also tried playing in Edge (I usually use Chrome) but no difference there either