I gave you some feedback on reddit, but would love to share more if you like.
I encountered also the issue with left and right click and that i had the feeling that sometimes the units does not what I want hem to do... described it in reddit more
Did you use any tutorial or are you just a advanced game developer? I am also starting on working on a turn based game but always looks for nice resoruces to learn from
Tutorials I haven't. What I did was research for some things I wasn't sure of how I could do, such as the drag-to-select feature, but the majority I did by myself.