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Premium content complaint.
1. Nowhere is the cost of Premium stated in the game. This is courtesy you should show your players.
2. Premium content is barely adequate enough to rationalise paying.
3. Replay-ability is minimum. While the game provides a superb challenge 19 maps is not enough to provide a tower defence with replay-ability.
Gemcraft Labrynth, a game of the same genre and era, is cheaper, provides more content for paying and has a higher replay-ability.
But the number 1 reason I really don't want to pay for premium content is that the price isn't displayed anywhere. It's $6. Why be ashamed to tell people it's only $6?
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This is such a fun game that i just had to get it on my I phone
one thing that i would love is if you made even more towers like maybe a Stables that allows you to train warriors on horses that would increase the speed and also maybe like a Colosseum that trains spartans that can throw spears