Summoners War: RUSH

Summoners War: Rush is an idle RPG featuring familiar faces from the popular Summoners War franchise, but in convenient portrait form. Everything can be automated in the main campaign, with a tower defence mode, you can also give it a go if you're looking for something more hands-on. I personally don't see how long it can hold my attention, but if the initial adrenaline rush is enough for you, then your mileage may vary.