I loved the game, it was very funny. So here are some feedback for you, because I run through some problems when playing.
When i played on full window, the return button at the end of the fight, was invisible. The only way to make it visible again was to reduce the window size.
Then, I didn't understand the aim of the three last items of the shop.
I have also some comments to make on the UI. It feels weird to me that I can't see my stats when choosing the next opponent. It's frustrating to close the window to check them.
Next, It give me the impression that the UI isn't consistent. For instance, the scrollbar, or the UI borders are not in the pixel-art theme.
Of course these comments are minor. The game graphics are really cool. I especially like the 'sink pigeon'. i would love to play with this one.
Obviously, as other mention, some stats are overpowered. Also, gold rewards seems to be a bit high for my taste. it allows you to have high stats using the shop.
That it. I hope these feedback will help you make the game even better. Do you plan to continue the development of the game in the future?