1) Ability to enter each of the 30 levels individually - failing that have the level number displayed when you are playing. I wouldn't mind if levels were not available until the previous level was completed and you could also have a star rating for the various lives lost in completing the level. 2) Some indication of the enemy composition of the upcoming level. 3) Some visual indication of the upgrade level of the turrets - number/dots/colour?...

Hello gamers, We think about adding a challenge map. Probably it will have 100+ waves. And if you like it we can change it in certain periods and make it continuous. What do you think about this subject?