Really good game.... the idea is very cool. I found myself replaying it a few times.
I feel like the controls for both the characters and camera need some work. I think I'd rather have the camera tied to the character group... allow the clicking to move or the WASD to move the player group around. You could almost treat it as a dual stick shooter. Move with WASD and Aim with the mouse.... then have the camera follow with a little bit of easing.
Great concept... I think this game could do great on PC or Mobile.... collecting different character types for stronger groups... the player could even collect different unit types and create "teams" that are then scattered throughout the level so you can recruit them during the level.
Great job.... very good submission.