Thanks for playing Antis, first of all!
About the tutorial — you're right, I probably should've given players a bit more time to read it, I just didn't want it to feel too long, since I see it more as a little extra to help understand the game before it really starts.
As for the other questions about food and ants, it's pretty simple:
Each day, every ant eats 1 food, and the queen eats 5.
So if you have 10 ants, you'll lose 15 food per day (10 + 5).
You need harvester ants to gather more food than they consume!
But if you made it to the end, that means you figured the system out!
Either way, if you enjoyed it, I'm really glad!