Very original idea -- I loved it. I felt like I was a general in one of the battle summaries on Youtube (https://www.youtube.com/channel/UC8MX9ECowgDMTOnFTE8EUJw)
Some suggestions:
- Some sort of feedback animation when killing an enemy would make attacking feel better
- Maybe let some fallen soldiers and enemies stick around laying on the battlefield? I wonder how it would feel to see the remains after an attack.
- A reward for a perfectly timed arrow block would be sweet
Overall, I loved this concept. Please turn it into a full game!