On one hand I like this game and didn't see anything particularly wrong with it. On the other hand, what feedback can I give? It's not a very long or complex demo, there's not a lot that can go wrong (I did play the whole demo). Something that I noted early is that selecting a sniper and clicking the enemy unit moves all the way to them when a sniper would want to move to a ranged position. But that's really just an issue for new players. Looking at the Steam short description and so on, I think players will ask, "What does this game do differently from other games in the genre?". So consider what could make it more noteworthy.