I always thought the hjkl movement for constructing walls and floors was very cool and vim-esque. But then the fact that you can't build a wall with more than 10 segments at a time ended up being one of the most trying aspects of the game for me, where I loved focusing on building a 3-tier outer castle wall with fortifications on the outside with steps going up and down on the inside and my army patrolling along it's border.