Having played the majority of your games, I have the following comments:
1. Your art and sound assets are great. While everything is simple, it's all self-explanatory.
2. the UIs always need work. Anything involved with a menu system or selection screen is confusing. Even the town screen is confusing, where all the buildings look the same and require me to memorize what is what before I can even use them. Furthermore, this is my first encounter with the game - a homogeneous town with no explanation. I had no idea this was about arena fighting until I clicked around randomly and was thrown into battle.
This game is kind of weak. Love the gameplay, but it was quick. Just get the barbed wire and the revoler with the upgrades, then save for the uzi, then the assault rifle. Beat it in 32 flat, never slept.