I've been playing a lot of Slay this week.

It's my favorite 'conquest' type of game. Been playing it off and on for many years. I would call it 'simple but deep' in the same sort of way chess is. I dare even call it elegant. I like how it forces you to take calculated risks, lest you be overrun by the enemy. But there's still a time and place to turtle up.

There's an excellent free, online clone called Konkr. I highly recommend checking it out of this interests you.