Very satisfying to watch the little guys battle it out and a good ethereal mood overall.
On the web I do get quickly deteriorating performance after level 3.
Personally I think the scrolling background is not the best match for the battle phase as it breaks the illusion of watching the tiny troops walk around, I think changing other parameters of the shader without such obvious directional scrolling would be nicer here to keep the battle feel more grounded (or just have another layer that does stay stationary could work as well).
Not sure if I just didn’t find it but an ability to drag already picked groups off the map to undo their selection would be nice.