Very nice entry, very nice atmosphere!
Got down to 300 then, unfortunately, crashed - as in me, not the game.
It's kind of harsh to take 10% hull for even the slightest collision, I would have preferred both damage and alarms going off if your velocity is over some limit, or if you definitely want contact damage, chip 1% off for every time a new contact is made with the wall.
You already have the lights and oxygen as a heavy incentive to not idle at one place for to long, so a not as harsh punishment wouldn't be too bad.
My two cents.
Other than that, great atmospheric entry!