Nice sound and visual presentation, although it probably could have gone with sound that fades as you gain distance from an object instead of it having it play globally. UI felt a little awkward to use but once I got used to it then it was fine. Eventually though I got to the point where both sides were overwhelmed with archers and that any enemies that spawned would instantly die. This might be because of a glitch where allied units collide with each other, causing the enemies to clip through each other and slow each other down. I can't really say whether the game's strategy aspects are designed well or not because of this bug. It's hard to tell if the game is ramping up in difficulty if the enemies are just cluttered and clipping through each other into one corner while my 50+ archers wail at them from a safe distance (all while going back for an occasional water break).  With a bit more polish you'll have a great starting point for a fun strategy game!