Thank you very much!
The "males and princesses" class includes all fertile ants, who usually have wings: males (or drones, now that I know this term), and future queens. The high-color part of the artwork is from the pre-Twine proof of concept made by another artist.
A background is a cool idea, and would be very easy to do (2 lines of CSS), as long as it's completely static. However, I'm thinking of changing the background during the story, like having a storm when you're at war, etc. Twine might show its limits for that :P
As for the errors, I might have done the English translation too quickly without fully testing it, I'll look into it.