This is amazingly terrifying, preying on a very specific fear of flying into the void. The scale of the structure and the dispensability of your character gives an incredible atmosphere, with some pretty good sound design to boot. I get it's meant to be unforgiving, but a checkpoint system would be welcome. The game does have some stakes without one, but having to start over each time did keep me from experiencing the rest of the game. Great work!
Also, you might enjoy a game called Lorn's Lure if you like climbing megastructures like this.