You used the word Scale in built to scale as a noun. Clever!
The music was deafening. I restarted the game and used your options menu to decrease it to the minimum but it was still pretty loud.
You throw a ton of text at the player to start. You would be surprised what players can figure out, perhaps try and let them experiment a bit before hitting them with all that info.
The mechanics are pretty clever. In these types of games a good strategy is to create a ton of units at once to overwhelm your opponent but in this system players have to be a little more selective with their units.
There are a few typos in your tutorial text.