Pretty standard turn-based tactics, I think? I never really played any of this kind up until now but I think I caught on quick.
I think it'd be great if the player could visualize who's going to move next. Like, a "next to move" queue. There was stage 2-1, right? And I didn't really know where I should go first - the enemy formation was symetrical and I didn't know which enemy will move next so I had to trial and error.
That would also drive home how the Wait command works, and what's its point.
In the end, it's a fun game, Even with the small variety of units, the game is balanced - I can really tell.
Okuu no! That's a yakuza!