Awesome game, definitely one of the most fun I've played thus far. It held my attention much longer than most submissions for sure. It was very satisfying to pack the board as tightly as possible. Amazing art and great music. Here's a few ideas that I think would immediately push this game even further:
1. Sounds effects would go a long way in making this a more immersive experience. Especially on attacking/getting attacked.
2. I think adding some incentive for the player to be quick about making their move would help a lot with holding the player's attention.
3. Some kind of bonus/critical hit for a fully packed board would be awesome, it already felt nice whenever it happened so adding a bonus would really make the player proud of themselves.
4. New enemies that affect the board in weird ways
Again, its an awesome concept, you should really develop it further.