Hi......I have played the game. I think that it is a very special game. A special tower defence game! I also played several other entries of this jam. (In fact, I played many BASIC games on Itch.io!) DefCon is very different from the other entries. Why? It is because the enemies don't have fixed route(or routes). However, this design is a really nice try! Different from traditional tower defense games.
Another special point is that Defcon looks more difficult than other entries which I have played. At first, I thought: "Wow, why level one is so difficult?" Anyway, I was able to complete level one after some tries.