Fun game, very much enjoyed it.
A little bit of feedback on player experience. I invested in the bug catching upgrades except the boots early because I wanted to complete catching all of the bugs in the first area first. Then I found my opponent out classing me. This was fine, I could catch bugs to get candy and level up my bugs. When I did this and finally defeated my opponent it felt great. But when I bought the boots I forgot about the cost to go to the second area and bought another upgrade as well leaving me with exactly 1 coin. So although this was my fault, it felt pretty discouraging to have to repeat the grinding process. Maybe a way to get a very small amount of money without having to battle could avoid this happening.