Im not sure if it was on purpose or not, but sometimes the exits wouldn't work. But besides that it was a fun little survival :) Oh I also only noticed the last broken thing when I was getting to the rocket. Not sure what that did.
Yep it was on purpose :D. You have electricity transformers in the right down corner outside, and if they break, they will lock random 3 out of the 4 doors.
The music with alarm sound should help you identify, if something needs repairing.
