Great game, I've been playing it occasionally for months now.
One feedback for version 11: Items in shop are sparkling, even if it is not possible to merge them with currently owned items right away. Especially at the later stages of game this results in confusion because of lot of sparks. I think that previous logic was better - sparkles were only on the items that can be merged with owned items right away.
For this sole reason I'm staying with older version 10.