Personally, I'm somewhat charmed that it threw me into battle without an explicit tutorial… although that's probably because I'm familiar with Advance Wars.

However, even for me, the unlabeled buttons were confusing (both the unit actions and the buttons on the side).

And I would have wanted some way to show an info panel for a given unit describing what the unit can do, its strengths and weaknesses, etc. Indeed, I tried several interactions in the hope of getting one. I tried clicking a unit and then moving the mouse to the box at the bottom (the one that appears while you're mousing over the unit and shows the unit's name etc.; I was hoping that clicking the unit would make the box not go away after the mouse left the unit). I also tried clicking the unit and then clicking the info button on the right, as well as right-clicking the unit. Just mentioning this as weak evidence for what kind of interface users might consider intuitive, if you do add such a feature.