Possible soft lock: if one of the kids flies off into the mountains at the top of the level, it may be impossible to lure him back. You may want to make them orbit tighter, to prevent them from flying off like that.
Edit: Had no clue where the little guy went afterward, tried quitting, but learned my progress did not save. Everything was fun till then, a nice little time waster with fantastic breast expansion animations and an element of skill and power increases with the enemies, but this just ruined a good chunk of the experience.
The little beasts shouldn't fly around so much, especially since enemies force you into evasive maneuvers, too.