The game suffers greatly for a lack of completed levels, but *this* failure to communicate is down to the lack of instructions or a tutorial.
The sky is the clock. You have until dark to get home. Sadly, I don't think there are enough levels to exhaust the time limit unless you play on "hard." Hence, most players won't notice much change.
Regardless, we are feeling the consequences of the level situation all over. One of our teammates suggested that we designate a level designer next time around who can work all jam through. Wise, I think.
Thanks for reviewing!