@D34THM4CH1N3: The booster packs can give sardines card (I just got one of 15 sardines), so the game already has what you asked for.
@the dev: Thank you for another work well done. If I were to make suggestion, I'd like to see a bonus shop option to upgrade starting cash. After a while, starting day 1 with level 1 crate, coil, balloon, and rc heli gets old. ;)
That's an interesting idea!