Thanks for the feedback! I am glad you enjoyed it. I hope your eyes will recover :D
Yeah the porcupines with the 2 block ceiling space just have a tiny time frame. We had to train a lot to jump over them ourselfs. Maybe this should have been a sign, that it is not a good game element. :D
We had a problem with the shader. In the windows version the shader is a little bit easier on the eyes. In the browser sadly there is some "moving rectangle border" effect which does not occure localy but there wasn´t enough time to investigate.