Hmmm ... in general I'm not a fan of flash fiction and unfortunately there were no exceptions here.
"Health Tips for Traveler" -- Hard to follow (might have worked better if I read it), but I saw the ending coming a mile away. Okay, at first I though the aliens were planning to eat the human travellers (references to fat and hydration), but then there must have been some hint because I figured out parasitic infection before the end. It was so hard to follow that my mind wandered off during the listen, though, and I only barely came back for the ending.
"Echoes of the Bouncing Ball" -- Okay but again not a huge surprise ending.
"Tornado on Fire" -- Silly, not terribly, but totally forgettable. I could not for the life of me remember the third story until I saw it mentioed again here. But, OMG, tornados on fire are real; goggle images have pictures!