Thank you for playing! :)
There's no reload, it works a bit different. Since I have only one button, I'm using timers for the different actions. If the LMB is pressed for less than 0.2 seconds, than it shoots, otherwise it moves the player. So, what you might experiencing is probably your fingers are getting tired, and one click takes more than 0.2 seconds, therefore the character starts to move instead of shooting.
The other things you mentioned are planned to be implemented in the future release. Once the jam is over, I'll start working on it.
I'll try your game for sure, Godot rulez! :D