I really like the idea of gathering up a small army like this, its satisfying having a bunch of soldiers following you around, sort of reminds me of an rts/platformer hybrid. I think this idea could be really cool if it was expanded on with things like multiple unit types!
One gripe that I had was that the combat felt a bit weak. While watching a bunch of soldiers mow down enemies is cool, there isn't any feedback on the attacks. Things like screen shake, particle effects and sound effects go a long way in a game with as much combat as this. Still, I had fun with this one, good job!