It me again. Been thinking about a lot. Idea, a way to add new pieces to the board. That encourages taking over areas since it becomes the only real way to end a match. Also forsight, newly spawned pieces don't add to your money. That's the reason I destroyed everything most of the time, letting pieces spawned during the round would result in people never leaving the first game in order to obtain infinite cash.
Thanks for still following the game. In fact that's what I thought during ludumdare. But at the end of the jam there was a bug in the enemy AI system and I didn't have time to deal with it causing me to simplify a lot of things.
I took a long break. and planning to get back into this project.
If I still want to keep the rule of occupied areas. I would put an invincible enemy piece on board like about after 20 turns that slowly moves towards your territory, destroying everything in its way. (Forcing the player to occupy the territory quickly to end the game)