How to improve on what could be a great game!
This has the basis to be a good game, it just needs some tweeks.
1. Mini-map to show where the units are on the entire field. Scrolling left and right is slow and unintuitive.
2. Some other way to increase gold acquisition. It is way to slow and sporadic to effectively use any strategy other than "zerg" with the current way to get gold.
3. Lower experience unlock requirements, especially for the soldier. It takes WAY too long to get what is only the third unit type.
4. Technical: If you turn off the music, then start a new game the music will come back and there will be no way to turn it off after that.
5. Branching ways to get to the other castle. It will increase strategy, and actually give a reason to look over the field during battles.