A solid idea for the theme. The graphics are pretty simple but get the point across, I noticed and liked all the small touches you added, like the objects fading out when you're behind them, or the text scaling up on hover.
It took me a while to find food, and I reloaded several times. I think maybe having a minimap could've gone a long way in helping the player figure out where they're at, both location-wise, and food-wise (although that can be really hard to implement). Or maybe an option to zoom out for a moment if you stand still and press a key ? Even an arrow pointing towards the hive would've been super helpful in keeping track of my position, it's really hard not getting lost, although I guess that's part of the experience of being an ant :)
I think you did a great job at explaining the concept of the game, although one thing that tripped me up is that I figured out leaves were food only like after 10 minutes of playing (since you cannot eat bushes and trees, I thought leaves were also decorative only), so having a list of food at the beginning could fix that.
Regarding the UI, I feel like you can't reassign the number of workers on a particular food? But the windows still shows up if you click on it. Having to type in a number is a bit jarring, maybe having a + and - button on top of that could make things smoother. I'm also not sure if there's a way to get the exhausted ants back to work, I couldn't find an explanation for that.
I feel like I've talked a lot about negatives and possible improvements, but all in all it was still relaxing to walk around and assign workers on food, it would've been really great with small tweaks and QoL improvements here and there. Well done :)