Thanks kasdf! Appreciate it. Yeah I think I've since fixed a couple of bugs I had regarding near frustum plane clipping and the portal sometimes flickering, and the lighting (not to mention texture mapping) does make the portal thresholds pretty obvious. Also the nested portals are a frame behind with aligning the camera it seems. Perhaps one day I'll go for a seamless portal with stylised shading or something. Yeah haha the cutthroat platforming has been a big let down, a center dot would be good, or even just better cues and some collision forgiveness. Thank you for playing!