Interesting game, I see how it can be expanded even more with lot's of content.
Don't know why I need to bet human organs to improve my bug, but I see how it would be cool to grow bugs and mutate them with different mutagens to add new abilities and improve stats. And before the fight I need to choose from my collection a bug and he can actually die. So yeah, cool idea, maybe these thoughts will inspire you.
As from things to improve, the actual fight feels way to random, and sometimes it's painful to look at 2 bugs just run around and cannot touch each other in like a minute.
Overall good job!