Cool game. Unfortunately, right before the boss fight with the engineer when you drop out of the pipes, the escape key stops working so it's impossible to save. I made it all the way to the place in the sky where you dodge bullets and lasers when I died and had to go all the way back. Will have to call it there :/
I didn't really do anything special. I opened up the little hatch, dropped down, and the guy had his monologue before running into the room where the boss fight takes place. I know escape works in the previous area because that's the maze where hitting escape takes you back to the beginning and that's fine. As soon as I leave the maze, escape no longer works.