Crystal War is amazing and pretty challenging (definitely not casual like many Idevice games). There are also two campaigns for humans and orcs. Think of it as a 2 d Warcraft because it is a tts game with resource gathering and all just 2d. There is also the battle of puppets which I also heard is awesome and similar but haven't got into much yet due to how hard crystal war is to beat. Also stick wars 1 and 2 look intriguing and I got galcon fusion as well which I heard rocks. Oh and Settlers HD rocks.