when you complete the pyramid in the desert, you will have acces to the meadow; when you complete the doungeon in the meadow, you will have acces to the tundra...
You should either delete the trade 3 Potions for 1 Slurpy" in trade post, or buff the trade to something like this: "1 Potion for 2 Slurpies". I mean, why would I trade 3 potions for a SINGLE slurpy?
Next update changes chests a lot. But for now, yes, no need to be sad if you loose too often :p