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Fantastic reply value, with great breadth of characters (with unique abilities), randomly generated maps, and random loot items. Relaxing pace given it's turn based, whilst still challenging. Collectable achievements, and fun combat too. One of the best mobile games I've ever played.
ProTons of replayability thanks to the randomly generated levels
ProHas a reasonable amount of strategical depth where the player can easily plan out their next move
ProChallenging and fun gameplay that lends itself well to repeat plays