This is a creative concept! I had fun playing it, but i do have a couple points of feedback.
The critters were really fast, so when the are moving around me, they would get out of the flashlight radius really quickly, and i felt a bit frustrated trying to track them. Maybe more constant audio feedback would help.
One time I tried to press pause, and it released my cursor from being captured. The problem is that it would never re-grab the cursor, so trying to turn back around my mouse would go off the screen, I had to restart after this happened.
Overall very cute, and very creative concept. That is a mean Dr doing that to the critters.
EDIT: P to pause then Resume re-captures cursor :D