I like how a new map is generated every time you lose a life! But, I feel like a health bar for each life is needed, since right now, i feel like its too harsh on the player with only giving you three strikes and an out. The gameplay itself is mostly just your standard tower defense game. Although, I'm not a fan of how the enemies start running before you have a chance to think about where/what people are placed. But i think that might just be part of the gameplay/pace. Nonetheless, great job! :D