I don't think 300 food for 100 gems is good either, but the tactic is to upgrade stuff when you can and decide which things you wanna upgrade at that time, i'm not a pro but i'm kinda close. The game is really fun and cool, but you have to make the right choices, i'd recommend watching a few guides and tips and tricks videos to improve knowledge of the game and get a stronger colony. Good luck, since this game gets rough sometimes if you're not prepared.
I try the game for 2 days. Cool concept but it feels more like a bug colecting game than an ant game. The fact that I have to keep my phone running for the currency to go up is bad design, my battery most likely can't handle it.
My favorite feature: Seasonal Creature, they implement a real life creature that has name/design that fit the season: Ghost Mantis for Halloween, Christmas Spider for Christmas, Paussinae Beetle for Valentine