I enjoyed it. good job.
Had a little trouble starting, cause it froze up on the splash screen twice, not sure why.
A couple things I would do that I think would be improvements,
The controls, maybe have the leg rotation gradually move towards the body rotations, so that you can steer with the mouse, and use A and D as strafing buttons, that may make the combat feel a little better.
the Elevators, if they just sensed what level you were on, and waited for you to get on before they activated... waiting on an elevator isn't fun.
Put some kind of flash or indicator on the thermometer. For way too long I just thought I was taking damage to a glitch that seemed to happen when I was on the stairs. I didnt realize I needed to buy the insulation until way late.
Overall really fun though!