In the Sandbox mode, it seems that unit customization only applies to one team. It would be far better to allow both teams to be customized. Any way to change this?

You need to re-design the tutorial! First, the text must appear all at once. Currently it appears letter-by-letter and much slower than my reading speed. Second, you need to start with player's actions. You're showing 30+ messages before the player can do anything, and by that time I was totally confused and already lost interest in the game. You need to playtest the tutorial on random new people. Just find a friend (or hire someone), give them the tutorial and listen to their complaints - that's the only ...