I like the minimalist aesthetic - it immediately made me think of the tutorial levels for System Shock 2. The Stephen Hawking voice was cool.
It was a pretty tense shooter (especially later in the levels knowing you would have to restart) and good tactical management of health (having to avoid picking up health if you're about to go into a fight).
I like the representation of screen brightness as health, though I would have liked some more feedback on the enemy attacks (I was not even sure at first what was happening because they don't shoot bullets, you just take damage, and you seem to not be able to take cover once they start shooting).