Yeah I'm sorry man, I don't want to be a dick about it or anything, I just felt like there wasn't enough there.
What I'd say is:
Either shorten the distance between the beacons, increase movement speed, or have something happen in between them;
Have some sort of additional exposition, maybe in the form of notes or something at each beacon or at spots halfway between them
Some sort of interaction or an area that funnels you past some of the sentries so that you have to actively avoid them instead of just looping around them
Some sort of scenery, like the little area at the beginning with the rusted out bus and the other decorations was interesting, so was the crashed plane, but then it kind of stopped.
It doesn't have to be huge changes just something more than "go here touch this". You have a solid base, you just need to expand on it