I'm glad you like it despite it's not as finished and polished as I wanted.
The "idle" animation was on the todo list. But I thought no one will notice it anyway so it has low priority. As you pointed out there are more important features that remain unfinished.. Even it's a 72 hours jam, I worked on it only from saturday evening to sunday night (including sleeping of course). So I didn't make it. I found interesting the mechanism of promotions which changes movement rules during the game. Therefore I decided to implement this. Unfortunately it was at the expense of other game mechanics.
Anyway I was quite satisfied with what I managed to finish in given time. It was great experience (i was my first game jam) and lot of fun! :)