You have an interesting core concept that could have used just a little bit more polish. The tacks confused me. I would have liked to see where they were placed (for my own tacks, of course; showing the enemy tacks would take a lot of fun out of it). I would also like a clearer indication of where the opponent(s) are heading. That could even lead to some fun moments of subversion of expectations, where I make moves based on which way the enemy is moving, only to have them suddenly change course! :O

Nice idea with the staircase, and gives quite a polished feeling for a 3-hour game! I think the menu (vs "campaign mode") was a good choice. The tacks were a bit confusing to figure out, i.e., whether they are time/place dependent.

This is a really interesting use of the theme, and I had fun figuring it out as I played. Adding the ability to customise the level is a nice touch too.