It appears as though there's a particle effects issue with the forking pathes floor whenever you have to start it over again. Dunno if you were intending to make fog for deeper floors or if this is a mistake with the reset. But even on the fastest graphics setting it's slowing me down, so perhaps a way to turn the particle effects off at some point would be necessary in your next update?
But other than that, I'm really liking the premise. I just can't seem to figure out how to get out of there! And the particle effects slow me down with each reset ;;