I won't join into the chorus about marketing being the key (it really is), but I did see this: "We're the creators of the critically-acclaimed iOS game, '100 Rogues'". I bought that game on sale for iOS -- after it had been updated a few times -- and I'm not sure what "critically-acclaimed" means. It had bugs out the wazoo, barely any variety in items/monsters/levels, and its non-standard UI had frustrating quirks.

If you have neither a polished product nor any real marketing, is it truly any wonder you're not selling well?