Hey! I didn't notice this suggestion earlier. That actually never crossed my mind to hold LMB to move. It took about 3 lines of code to implement and it feels good to control that way. Thanks for the suggestion! Seems so obvious to now :) I got a lot to keep track of with this game.
I plan to add a full options menu in the future. I will need to look into how to implement rebindable keys. I'm sure it's not that hard but I haven't tried before. Its on the list!