I had it down to just a few bits of health left, but my suit health was at 0% so I kept dying in a single hit XD doesn't help that I also didn't properly clear out the room before it, so I died a bunch of times on the way to the boss to pick up the suit...
Oh dang! I didn't realize you could make it to the boss without clearing all the rooms! I might have to try that and see if I can make it to the boss with more life that way lol