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It's more of an arcade game, there's not really an end. I was going to add a "time survived" and/or "enemies slain" at the end screen, but I ran out of time.
I too felt that selecting the units is awkward. I don't like how the game becomes very click intensive while also requiring some precision as it goes on. When there are a lot of enemies are on the screen, we can't see our own units health bar, kinda going against the premise of the game.