(This is a copy-paste of my Google Play review, since I apparently don't "own" a license to the app and my review was automatically deleted right after posting it) - I purchased it via the Humble Bundle.
This game is a great game! In fact, I got hooked into it to the point I play it instead of Clash of Clans (if I'm not already playing Geometry Dash).
It's so satisfying to be able to have a Dungeons-and-Dragons-like game in my pocket that I can bring anywhere and play at anytime.
The mechanics aren't groundbreaking, but it's included everything that I've forgotten to consider as a Dungeon Master.
The story's full of references to our gaming culture, but towards the end of the game, I felt that the story died after the "you have to save the world" bit... And the grind to the higher levels seemed impossible.
(I mean come on... I've finished all the quests elsewhere and all my characters are only Level 37, despite having to beat Level 50-60 bosses which naturally one-shot them all, and getting gold becomes impossible without having to repeat near-death dungeons as farming lower down becomes more and more redundant as you level up since the bosses are the only thing that actually yields descent (more than 40) gold.)
The only other problem with this game is (only applies to the Android version)... I can't buy the DLC or add gold.