So many ideas are being added, I can't seem to find and edit my own idea thread...but here's some more ideas:
-A slider on the minimap you can drag around your half of the map. When you click defend, all troops except miners go around that slider.
-The ability to select all of one type of unit. This would REALLY help with managing a confusing jumble of miners.
-Control a character in campaign. Obviously most of us know nothing about the campaign, but it would be nice to control a character like the first Stick Wars for single-player.
-Have Miners automatically begin mining a nearby gold mine when they're first summoned, so they aren't just sitting there while you direct your troops.
-Bring in a second, unnecessary advanced tutorial(s) that explains the game much further.
-Be able to retire units to get a tiny portion of your gold back. In later stages, I had to get rid of my miners to make space for more troops, so I ended up sending them all the the enemy which was a bit of a waste of time.
-Have a button that overrides a soldier's will to attack troops when he's commanded to move somewhere. Basically, he'll move first, then attack.
-More ways to defend! You could lay traps around the mines to attack soldiers, like spike traps, explosives, acid, etc. There could also be siege weapons to provide a better defense similar to crossbowmen
-More things you could do at the central tower. So far, the only use of the central tower to me is to summon a ghost Spearton when captured. Maybe the tower could release neutral buffs, debuffs, and traps.
-A more interactable environment. Rivers could slow movement, abandoned buildings and pits can hide soldiers from view, trees could catch fire and burn enemies around them, etc.
-A record of your previous battles (with names, friend codes, stats, etc.), in case you forgot to add a friend or want to just look around.
