Stickman Madness 3
You know the drill: hold out against waves of the enemy intent on breaking down your barricades and trashing your home in Stickman Madness 3. 26 days is the arbitrary length of time until you count as having fended all the irritating stickmen off, although by all means carry on playing afterwards. With a whole host of weapons on offer, each having their own perks, and your own skills to upgrade there's plenty to spend your hard earned gold on between days.
If that weren't enough there's also the option of hiring some mercenaries - up to four, in fact - to help hold you hold out. Each starts with a different selection of skills just as you do - and come with their own preferred weapon - and can also be upgraded between days. With all of this on offer, Stickman Madness 3 is likely to get you hooked to playing for quite some time.