I really liked the concept. Visually, I liked the style. I'm somewhat bug-phobic and my ant movement made me a bit shuddery (I say that as a compliment). Audio was good too - complemented the game and not too distracting.
Game-play wise, it's not my preferred genre as I struggle with games that require skill and strategy for combat, especially switching between keys. My reaction times are terrible. That's not a criticism - I think it's good that you've made a game that involves thinking about what you're doing and not rushing in. I'm only mentioning this to explain that I don't have specific feedback on the actual combat mechanics as it's just not the kind of thing I'm knowledgeable about.
I enjoyed the game anyway and am impressed you came up with this in such a short time. Good job.