The game looks really interesting but I also struggled with the fighting system. Maybe you can add a short description to the game page to explain the icons?
The game started full-screen on my 4k monitor and that really messed with the UI. So, like adriaan, I also recommend doing a HTML5 build so that it can be directly played on the itch.io website!
Anyway it's a nice little prototype and I like the art! Good job! :)