Good game with potential. I suggest that the description of books include a description with the required amount of mana, not just the level. Currently, the amount of required mana can only be checked after equipping the book and checking your statistics. The generated maps should be a bit smaller because walking takes much more time than fighting. In your own inventory, it would be nice if you could sort items by type, just like in a supermarket.
You should consider add tilt button. Sometimes balls stuck in tubes or flat surfaces. Game need some more types of upgrades. I think more balance in merging would be better:
3 balls x 2 points after merge = 5 points ball
3 balls x 5 points after merge = 8 points ball so its better not to merge.
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