I'm not sure why, but it's pretty unplayable for me - maybe it's playing with a keyboard? Can't move the camera, Heraclos moves at the pace of a very heavy snail, and on top of it all, I got a glitch where Heraclos either moved a rock in the second area (the one right after that first portal) that blinked out of existence, or it didn't exist in the first place, or possibly just stopped responding to the command. My internet connection is fine and my laptop is running smooth as silk without issue, so I don't think it's on my end....no idea what I did wrong.
if you are using linux, it might be an issue with the framerate, if so you can solve this by simply adding "vblank_mode=0" without quotes before your browser command in the terminal
Ex: "vblank_mode=0 firefox"