I've never seen an RTS combat style game in a game jam. It was a neat idea. This was pretty ambitious for a game jam.
The footsteps got old quick as they were way louder than everything else and there was no game music. Once the units were engaged, you could not pull them back - which was frustrating because the rogue units ran faster than the warrior units. It would have also been nice to select groups of units by type, and assign units to groups. As it was, there was no tactical gameplay. It was just consume and move forward. The game lagged so bad I quit right before I faced the giant knight, but that may have been my videocard. I've been having problems with it. Finally, the controls were a bit difficult to use and the motion blur when rotating the camera made me a bit nauseated.
There's a lot of potential here. You have the foundation of a fun game!