Great effort at an RTS! I found it quite hard to start but the added bonuses when you complete a round are a great idea. Unfortunately I had significant performance issues after the fourth box was revealed and the fame rate really slowed down to make it unplayable, so I didn't progress further
Seeing what was going on with the small characters and trees was quite hard, and they have a tendency to stand on top of each other when told to go to a location so you can't see how many you have.
The tutorial was really good and well explained. The sound effect of Boxxy talking was quite annoying though, it could be a little quieter and that would help. When I built my barracks I didn't know what size it would be, and I ended up putting it right over my castle!
The UI boxes for the buildings were a bit off. With the background being translucent you could see what was going on in the main screen behind but not click it, and I think that made it hard to know if you had clicked the soldier. There was also a sound effect to say you didn't have enough money, but not one to say you had successfully build a solider. In the tutorial I accidentally built six because I didn't realise I'd clicked it. I think some fonts had not been implemented in the UI box titles too.
Overall great work, with some polish this could be a really good game!