Hey, sorry for the late reply. I guess I didn't make it clear clear, but you can actually press 't' with a character selected to make them target something.
Thanks for implying that anyone would be interested in expanding my source! I've added the file 'LICENSE' with an MIT license over on my GitHub:
https://github.com/tdwsl/dungeon-team
As for the art, yes I made it myself (I'm glad you like it!) - if you want to use it in any of your own projects, go ahead.
Thanks so much for taking interest in my broken game :P