I get tuck a lot when you get out of the tutorial "testing" evels. i run out of atp because I don't have enough mitochondrion organelles, but I can't build any because of the same reason. I couldn't build any before, due to lack of material in other ways. then i died. ugh.
HELP for those with kids invisible on the truck- just fire so that gravity brings the ice cream down on the truck. sweep the entire truck a few times and they'll be gone.
I love how freeform the game is. You can just take a completely unexpected path in many levels, such as simply shrinking everything but the final triangle and then growing that one to push the smiley in, bypassing the ball rolling completely.