I actually have a version that uses it, I kinda wish I'd left the button that toggles it enabled.
The post-Jam version will have it because it's interesting to compare.
A* ends up being *too* good. As-is the only real challenge in the game is routing your troops and getting the AI troops stuck on obstacles.
With A* that goes away and the game becomes practically non-interactive.
I think with more troop and level balancing and/or some other mechanics, it wouldn't be so disruptive