This game is MAJORLY addictive. That said, I'd like to see a progress meter on each turret's upgrades so you can see how far they are from completion. Also a cooldown bar at the top for your abilities would be appreciated. I'd also much like to see a rogues gallery or a log describing all the towers, and the ability to hover the mouse over the tower and get a complete description of what the tower's purpose and abilities are.
 "Enigmata: Stellar War"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "Not To Scale"){kind=icon}