I think it has great potential, especially how well it runs in the browser. It's fun, and I really like the graphics—they are clean and nice. I have a few points of well-meaning criticism:
-The line formation didn't work for me. Z + left mouse button didn’t do anything. I have to say, I’m not sure if I like the controls that much. I want to order my units with the right mouse button, and right mouse button drag to form a line would feel intuitive to me. I know that this is now the camera movement and you dont want to use the middle mouse button, I guess because of browser?
-The gameplay sometimes feels a bit unforgiving or random. I didn’t want to replay the large city map because my units kept hitting the wall, while their RPGs easily took them out.
-I found the icons (and also the units) a bit difficult to distinguish in terms of which weapon they were wielding.
-I would like to know what further gameplay you have planned. I think, with these mechanics, defense missions would be great fun—or something like fighting for capture points.
All in all, well done! It's a nice demo!