I just feel like too many of the rooms seem to never get any drops, and it's pointless to even check them. I have had a few games that went really well where I've been able to get to the point where she complains about not being able to move very well.
I do enjoy the moving mechanic as you get bigger, though I also agree that early on, a run or sprint would be a good decision.
I would love a vitality meter that gives an idea of how much time you have left.