The game needs:
1. More information/facts about turrets and upgrades. I won't buy upgrade "gives a burn effect" unless I know how much it burns and what duration.
2. More ways to spend gold ingame. I would like to buy in game turret upgrades.
3. Steeper wave curve. I didn't die to a non-compressed wave in days. Spending hours just to reach 5K waves is sad.
4. Kill stats on turrets (how many kills/hit/dmg did each turret)
5. Better balance in town. Some buildings/functions seem rather useless. Low daily mission rewards, low lucky wheel prices etc.