Fantastic entry, I have so many things I liked about it :D
The graphics are pixel art and you've chosen a lovely palette, all the sprites were clearly distinguishable.
The game was really easy to learn by doing by only requiring a mouse click on any square to see details, choose building, see resources etc.
I am definitely going to be exploring this game further, I got to the enemy with a reasonable force but they got mad and mobbed my buildings, fun!
Very retro gameplay, it could have been one of the first RTSes for sure :)
And my favourite part was the original idea to have play take place on a grid with strict collision. So many interesting decisions to make due to that.
I hope to see further development on this concept for sure :)