Good way to improve it by making a better arrangement for the swordsman and the barrack so you can easily upgrade the soldier, and probably shortcut like 1-9 is good for the soldier, for easier selecting the characters. Make the characters smaller and with more distance between each other would increase the friendly user inside the game. And make change on the soldier arrangement so it won't overlapping. In my point of view, the game is just too fast, hard to upgrade the soldier when they moving a lot and when the enemies just increasing like crazy. Upgrade in pause menu would be a good improvement, or should add slow movement options, or something else.
Good concept. If it's just a better game mechanism, I would give 4-5 star. But the inside game is just so mess up. Like when you want to click inside the barrack, it always get block by the swdman. So hard to upgrade in the right moment, and at the end always die before even able to upgrade the soldier. The swdman always overlapping. Especially when u make more than 3. 4-5 swordsman is a bad idea, when the level goes beyond 14. They moved too closed, even you can't click inside the barrack. For the inside game I would give 2 star. This game have a good promise though. It's just too hard for a player like me who's have a slow clicking hands. Overall, 3 star. Not quite friendly user in game mechanism.