A couple of bugs:
*Eggs seem to hatch every hour, on the hour - not when 60 minutes have passed after the purchase
*When flipping the last card of the row/column, any completion perks will not activate if the row contains any previously flipped enemies. The only exception is if the only the last flipped card is an enemy
*Aren't eyes supposed to be always visible at start? It seems that when combined with certain perks (maybe Close Call?), some eyes get dealt face-down
*After the latest patch, it seems that the hints about the corner enemies can now be duplicated