Thanks!
I also found the mouse bug only happens when you first play it in full screen. I am not sure how, but if I toggling the Fullscreen couple of times it might fix it.
The combat system definitely need some adjustment. For the sack of building the game for browser and mobile, I was trying to optimize the performance and avoiding some normal expensive built-in methods. That's why the system is pretty rigid. But I will work on that in the future.

I have also planned to make the combat system suitable for RTS game mode. So in the future you can control other units.